1 files changed, 4 insertions, 73 deletions
diff --git a/mfbt/WindowsVersion.h b/mfbt/WindowsVersion.h
index f8b071861..4d0cb374b 100644
--- a/mfbt/WindowsVersion.h
+++ b/mfbt/WindowsVersion.h
@@ -84,45 +84,12 @@ IsWindowsBuildOrLater(uint32_t aBuild)
   return false;
 }
 
-#if defined(_M_X64) || defined(_M_AMD64)
-// We support only Win7 or later on Win64.
-MOZ_ALWAYS_INLINE bool
-IsXPSP3OrLater()
-{
-  return true;
-}
-
-MOZ_ALWAYS_INLINE bool
-IsWin2003OrLater()
-{
-  return true;
-}
-
-MOZ_ALWAYS_INLINE bool
-IsWin2003SP2OrLater()
-{
-  return true;
-}
-
-MOZ_ALWAYS_INLINE bool
-IsVistaOrLater()
-{
-  return true;
-}
-
-MOZ_ALWAYS_INLINE bool
-IsVistaSP1OrLater()
-{
-  return true;
-}
+// Although many of the older versions are not supported, we should keep
+// these entries for completeness (since they don't take any resources of
+// note), and to cater to corner cases for applications running e.g. in
+// Windows' compatibility mode.
 
 MOZ_ALWAYS_INLINE bool
-IsWin7OrLater()
-{
-  return true;
-}
-#else
-MOZ_ALWAYS_INLINE bool
 IsXPSP3OrLater()
 {
   return IsWindowsVersionOrLater(0x05010300ul);
@@ -157,7 +124,6 @@ IsWin7OrLater()
 {
   return IsWindowsVersionOrLater(0x06010000ul);
 }
-#endif
 
 MOZ_ALWAYS_INLINE bool
 IsWin7SP1OrLater()
@@ -190,41 +156,6 @@ IsNotWin7PreRTM()
          IsWindowsBuildOrLater(7600);
 }
 
-MOZ_ALWAYS_INLINE bool
-IsWin7AndPre2000Compatible() {
-  /*
-   * See Bug 1279171.
-   * We'd like to avoid using WMF on specific OS version when compatibility
-   * mode is in effect. The purpose of this function is to check if FF runs on
-   * Win7 OS with application compatibility mode being set to 95/98/ME.
-   * Those compatibility mode options (95/98/ME) can only display and
-   * be selected for 32-bit application.
-   * If the compatibility mode is in effect, the GetVersionEx function will
-   * report the OS as it identifies itself, which may not be the OS that is
-   * installed.
-   * Note : 1) We only target for Win7 build number greater than 7600.
-   *        2) GetVersionEx may be altered or unavailable for release after
-   *           Win8.1. Set pragma to avoid build warning as error.
-   */
-  bool isWin7 = IsNotWin7PreRTM() && !IsWin8OrLater();
-  if (!isWin7) {
-    return false;
-  }
-
-  OSVERSIONINFOEX info;
-  ZeroMemory(&info, sizeof(OSVERSIONINFOEX));
-
-  info.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
-#pragma warning(push)
-#pragma warning(disable:4996)
-  bool success = GetVersionEx((LPOSVERSIONINFO) &info);
-#pragma warning(pop)
-  if (!success) {
-    return false;
-  }
-  return info.dwMajorVersion < 5;
-}
-
 } // namespace mozilla
 
 #endif /* mozilla_WindowsVersion_h */