1 files changed, 0 insertions, 64 deletions
diff --git a/security/sandbox/chromium/base/threading/thread_collision_warner.cc b/security/sandbox/chromium/base/threading/thread_collision_warner.cc
deleted file mode 100644
index 547e11ca6..000000000
--- a/security/sandbox/chromium/base/threading/thread_collision_warner.cc
+++ /dev/null
@@ -1,64 +0,0 @@
-// Copyright (c) 2010 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.
-
-#include "base/threading/thread_collision_warner.h"
-
-#include "base/logging.h"
-#include "base/threading/platform_thread.h"
-
-namespace base {
-
-void DCheckAsserter::warn() {
-  NOTREACHED() << "Thread Collision";
-}
-
-static subtle::Atomic32 CurrentThread() {
-  const PlatformThreadId current_thread_id = PlatformThread::CurrentId();
-  // We need to get the thread id into an atomic data type. This might be a
-  // truncating conversion, but any loss-of-information just increases the
-  // chance of a fault negative, not a false positive.
-  const subtle::Atomic32 atomic_thread_id =
-      static_cast<subtle::Atomic32>(current_thread_id);
-
-  return atomic_thread_id;
-}
-
-void ThreadCollisionWarner::EnterSelf() {
-  // If the active thread is 0 then I'll write the current thread ID
-  // if two or more threads arrive here only one will succeed to
-  // write on valid_thread_id_ the current thread ID.
-  subtle::Atomic32 current_thread_id = CurrentThread();
-
-  int previous_value = subtle::NoBarrier_CompareAndSwap(&valid_thread_id_,
-                                                        0,
-                                                        current_thread_id);
-  if (previous_value != 0 && previous_value != current_thread_id) {
-    // gotcha! a thread is trying to use the same class and that is
-    // not current thread.
-    asserter_->warn();
-  }
-
-  subtle::NoBarrier_AtomicIncrement(&counter_, 1);
-}
-
-void ThreadCollisionWarner::Enter() {
-  subtle::Atomic32 current_thread_id = CurrentThread();
-
-  if (subtle::NoBarrier_CompareAndSwap(&valid_thread_id_,
-                                       0,
-                                       current_thread_id) != 0) {
-    // gotcha! another thread is trying to use the same class.
-    asserter_->warn();
-  }
-
-  subtle::NoBarrier_AtomicIncrement(&counter_, 1);
-}
-
-void ThreadCollisionWarner::Leave() {
-  if (subtle::Barrier_AtomicIncrement(&counter_, -1) == 0) {
-    subtle::NoBarrier_Store(&valid_thread_id_, 0);
-  }
-}
-
-}  // namespace base