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diff --git a/security/sandbox/chromium/base/threading/thread_restrictions.h b/security/sandbox/chromium/base/threading/thread_restrictions.h
deleted file mode 100644
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--- a/security/sandbox/chromium/base/threading/thread_restrictions.h
+++ /dev/null
@@ -1,266 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef BASE_THREADING_THREAD_RESTRICTIONS_H_
-#define BASE_THREADING_THREAD_RESTRICTIONS_H_
-
-#include "base/base_export.h"
-#include "base/macros.h"
-
-// See comment at top of thread_checker.h
-#if (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON))
-#define ENABLE_THREAD_RESTRICTIONS 1
-#else
-#define ENABLE_THREAD_RESTRICTIONS 0
-#endif
-
-class BrowserProcessImpl;
-class HistogramSynchronizer;
-class NativeBackendKWallet;
-class ScopedAllowWaitForLegacyWebViewApi;
-
-namespace cc {
-class CompletionEvent;
-class SingleThreadTaskGraphRunner;
-}
-namespace chromeos {
-class BlockingMethodCaller;
-namespace system {
-class StatisticsProviderImpl;
-}
-}
-namespace chrome_browser_net {
-class Predictor;
-}
-namespace content {
-class BrowserGpuChannelHostFactory;
-class BrowserGpuMemoryBufferManager;
-class BrowserShutdownProfileDumper;
-class BrowserTestBase;
-class GpuChannelHost;
-class NestedMessagePumpAndroid;
-class ScopedAllowWaitForAndroidLayoutTests;
-class ScopedAllowWaitForDebugURL;
-class SoftwareOutputDeviceMus;
-class TextInputClientMac;
-class RasterWorkerPool;
-}  // namespace content
-namespace dbus {
-class Bus;
-}
-namespace disk_cache {
-class BackendImpl;
-class InFlightIO;
-}
-namespace gles2 {
-class CommandBufferClientImpl;
-}
-namespace mojo {
-namespace common {
-class MessagePumpMojo;
-}
-}
-namespace mus {
-class CommandBufferLocal;
-class GpuState;
-}
-namespace net {
-class NetworkChangeNotifierMac;
-namespace internal {
-class AddressTrackerLinux;
-}
-}
-
-namespace remoting {
-class AutoThread;
-}
-
-namespace ui {
-class WindowResizeHelperMac;
-}
-
-namespace views {
-class WindowManagerConnection;
-}
-
-namespace base {
-
-namespace android {
-class JavaHandlerThread;
-}
-
-class SequencedWorkerPool;
-class SimpleThread;
-class Thread;
-class ThreadTestHelper;
-
-// Certain behavior is disallowed on certain threads.  ThreadRestrictions helps
-// enforce these rules.  Examples of such rules:
-//
-// * Do not do blocking IO (makes the thread janky)
-// * Do not access Singleton/LazyInstance (may lead to shutdown crashes)
-//
-// Here's more about how the protection works:
-//
-// 1) If a thread should not be allowed to make IO calls, mark it:
-//      base::ThreadRestrictions::SetIOAllowed(false);
-//    By default, threads *are* allowed to make IO calls.
-//    In Chrome browser code, IO calls should be proxied to the File thread.
-//
-// 2) If a function makes a call that will go out to disk, check whether the
-//    current thread is allowed:
-//      base::ThreadRestrictions::AssertIOAllowed();
-//
-//
-// Style tip: where should you put AssertIOAllowed checks?  It's best
-// if you put them as close to the disk access as possible, at the
-// lowest level.  This rule is simple to follow and helps catch all
-// callers.  For example, if your function GoDoSomeBlockingDiskCall()
-// only calls other functions in Chrome and not fopen(), you should go
-// add the AssertIOAllowed checks in the helper functions.
-
-class BASE_EXPORT ThreadRestrictions {
- public:
-  // Constructing a ScopedAllowIO temporarily allows IO for the current
-  // thread.  Doing this is almost certainly always incorrect.
-  class BASE_EXPORT ScopedAllowIO {
-   public:
-    ScopedAllowIO() { previous_value_ = SetIOAllowed(true); }
-    ~ScopedAllowIO() { SetIOAllowed(previous_value_); }
-   private:
-    // Whether IO is allowed when the ScopedAllowIO was constructed.
-    bool previous_value_;
-
-    DISALLOW_COPY_AND_ASSIGN(ScopedAllowIO);
-  };
-
-  // Constructing a ScopedAllowSingleton temporarily allows accessing for the
-  // current thread.  Doing this is almost always incorrect.
-  class BASE_EXPORT ScopedAllowSingleton {
-   public:
-    ScopedAllowSingleton() { previous_value_ = SetSingletonAllowed(true); }
-    ~ScopedAllowSingleton() { SetSingletonAllowed(previous_value_); }
-   private:
-    // Whether singleton use is allowed when the ScopedAllowSingleton was
-    // constructed.
-    bool previous_value_;
-
-    DISALLOW_COPY_AND_ASSIGN(ScopedAllowSingleton);
-  };
-
-#if ENABLE_THREAD_RESTRICTIONS
-  // Set whether the current thread to make IO calls.
-  // Threads start out in the *allowed* state.
-  // Returns the previous value.
-  static bool SetIOAllowed(bool allowed);
-
-  // Check whether the current thread is allowed to make IO calls,
-  // and DCHECK if not.  See the block comment above the class for
-  // a discussion of where to add these checks.
-  static void AssertIOAllowed();
-
-  // Set whether the current thread can use singletons.  Returns the previous
-  // value.
-  static bool SetSingletonAllowed(bool allowed);
-
-  // Check whether the current thread is allowed to use singletons (Singleton /
-  // LazyInstance).  DCHECKs if not.
-  static void AssertSingletonAllowed();
-
-  // Disable waiting on the current thread. Threads start out in the *allowed*
-  // state. Returns the previous value.
-  static void DisallowWaiting();
-
-  // Check whether the current thread is allowed to wait, and DCHECK if not.
-  static void AssertWaitAllowed();
-#else
-  // Inline the empty definitions of these functions so that they can be
-  // compiled out.
-  static bool SetIOAllowed(bool allowed) { return true; }
-  static void AssertIOAllowed() {}
-  static bool SetSingletonAllowed(bool allowed) { return true; }
-  static void AssertSingletonAllowed() {}
-  static void DisallowWaiting() {}
-  static void AssertWaitAllowed() {}
-#endif
-
- private:
-  // DO NOT ADD ANY OTHER FRIEND STATEMENTS, talk to jam or brettw first.
-  // BEGIN ALLOWED USAGE.
-  friend class content::BrowserShutdownProfileDumper;
-  friend class content::BrowserTestBase;
-  friend class content::NestedMessagePumpAndroid;
-  friend class content::ScopedAllowWaitForAndroidLayoutTests;
-  friend class content::ScopedAllowWaitForDebugURL;
-  friend class ::HistogramSynchronizer;
-  friend class ::ScopedAllowWaitForLegacyWebViewApi;
-  friend class cc::CompletionEvent;
-  friend class cc::SingleThreadTaskGraphRunner;
-  friend class content::RasterWorkerPool;
-  friend class remoting::AutoThread;
-  friend class ui::WindowResizeHelperMac;
-  friend class MessagePumpDefault;
-  friend class SequencedWorkerPool;
-  friend class SimpleThread;
-  friend class Thread;
-  friend class ThreadTestHelper;
-  friend class PlatformThread;
-  friend class android::JavaHandlerThread;
-  friend class gles2::CommandBufferClientImpl;
-  friend class mojo::common::MessagePumpMojo;
-  friend class mus::CommandBufferLocal;
-  friend class mus::GpuState;
-
-  // END ALLOWED USAGE.
-  // BEGIN USAGE THAT NEEDS TO BE FIXED.
-  friend class ::chromeos::BlockingMethodCaller;  // http://crbug.com/125360
-  friend class ::chromeos::system::StatisticsProviderImpl;  // http://crbug.com/125385
-  friend class chrome_browser_net::Predictor;     // http://crbug.com/78451
-  friend class
-      content::BrowserGpuChannelHostFactory;      // http://crbug.com/125248
-  friend class
-      content::BrowserGpuMemoryBufferManager;     // http://crbug.com/420368
-  friend class content::GpuChannelHost;           // http://crbug.com/125264
-  friend class content::TextInputClientMac;       // http://crbug.com/121917
-  friend class dbus::Bus;                         // http://crbug.com/125222
-  friend class disk_cache::BackendImpl;           // http://crbug.com/74623
-  friend class disk_cache::InFlightIO;            // http://crbug.com/74623
-  friend class net::internal::AddressTrackerLinux;  // http://crbug.com/125097
-  friend class net::NetworkChangeNotifierMac;     // http://crbug.com/125097
-  friend class ::BrowserProcessImpl;              // http://crbug.com/125207
-  friend class ::NativeBackendKWallet;            // http://crbug.com/125331
-#if !defined(OFFICIAL_BUILD)
-  friend class content::SoftwareOutputDeviceMus;  // Interim non-production code
-#endif
-  friend class views::WindowManagerConnection;
-// END USAGE THAT NEEDS TO BE FIXED.
-
-#if ENABLE_THREAD_RESTRICTIONS
-  static bool SetWaitAllowed(bool allowed);
-#else
-  static bool SetWaitAllowed(bool allowed) { return true; }
-#endif
-
-  // Constructing a ScopedAllowWait temporarily allows waiting on the current
-  // thread.  Doing this is almost always incorrect, which is why we limit who
-  // can use this through friend. If you find yourself needing to use this, find
-  // another way. Talk to jam or brettw.
-  class BASE_EXPORT ScopedAllowWait {
-   public:
-    ScopedAllowWait() { previous_value_ = SetWaitAllowed(true); }
-    ~ScopedAllowWait() { SetWaitAllowed(previous_value_); }
-   private:
-    // Whether singleton use is allowed when the ScopedAllowWait was
-    // constructed.
-    bool previous_value_;
-
-    DISALLOW_COPY_AND_ASSIGN(ScopedAllowWait);
-  };
-
-  DISALLOW_IMPLICIT_CONSTRUCTORS(ThreadRestrictions);
-};
-
-}  // namespace base
-
-#endif  // BASE_THREADING_THREAD_RESTRICTIONS_H_