Make the Vsync provider be the same for Vista and XP

ui/gl/gl_surface_win.cc

 // 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.
 
 #include "ui/gl/gl_surface.h"
 
 #include <dwmapi.h>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 46 matching lines @@
   HDC device_context_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewGLSurfaceOSMesa);
 };
 
 class WinVSyncProvider : public VSyncProvider {
  public:
   explicit WinVSyncProvider(gfx::AcceleratedWidget window) :
     window_(window)
   {
-    use_dwm_ = (base::win::GetVersion() >= base::win::VERSION_VISTA);
+    use_dwm_ = (base::win::GetVersion() >= base::win::VERSION_WIN7);
   }
 
   virtual ~WinVSyncProvider() {}
 
   virtual void GetVSyncParameters(const UpdateVSyncCallback& callback) {
     TRACE_EVENT0("gpu", "WinVSyncProvider::GetVSyncParameters");
 
     base::TimeTicks timebase;
     base::TimeDelta interval;
     bool dwm_active = false;
@@ skipping 272 matching lines @@
 }
 
 EGLNativeDisplayType GetPlatformDefaultEGLNativeDisplay() {
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableD3D11) ||
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kUseWarp))
     return GetDC(NULL);
   return EGL_D3D11_ELSE_D3D9_DISPLAY_ANGLE;
 }
 
 }  // namespace gfx