Make scrollAnimatorEnabled work on Mac like it does on other platforms

ui/gfx/animation/animation.cc

 // Copyright (c) 2011 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/gfx/animation/animation.h"
 
 #include "build/build_config.h"
 #include "ui/gfx/animation/animation_container.h"
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/gfx/animation/tween.h"
 #include "ui/gfx/geometry/rect.h"
 
-#if defined(OS_WIN)
-#include "base/win/windows_version.h"
-#endif
-
 namespace gfx {
 
 Animation::Animation(base::TimeDelta timer_interval)
     : timer_interval_(timer_interval),
       is_animating_(false),
       delegate_(NULL) {
 }
 
 Animation::~Animation() {
   // Don't send out notification from the destructor. Chances are the delegate
@@ skipping 58 matching lines @@
 
   if (container)
     container_ = container;
   else
     container_ = new AnimationContainer();
 
   if (is_animating_)
     container_->Start(this);
 }
 
+#if !defined(OS_WIN)
 // static
 bool Animation::ShouldRenderRichAnimation() {
-#if defined(OS_WIN)
-  if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
-    BOOL result;
-    // Get "Turn off all unnecessary animations" value.
-    if (::SystemParametersInfo(SPI_GETCLIENTAREAANIMATION, 0, &result, 0)) {
-      return !!result;
-    }
-  }
-  return !::GetSystemMetrics(SM_REMOTESESSION);
-#else
+  // Defined in platform specific file for Windows.
   return true;
+}
 #endif
+
+#if !defined(OS_WIN) && !defined(OS_MACOSX)
+// static
+bool Animation::ScrollAnimationsEnabledBySystem() {
+  // Defined in platform specific files for Windows and OSX.
+  return true;
 }
+#endif
 
 bool Animation::ShouldSendCanceledFromStop() {
   return false;
 }
 
 void Animation::SetStartTime(base::TimeTicks start_time) {
   start_time_ = start_time;
 }
 
 base::TimeDelta Animation::GetTimerInterval() const {
   return timer_interval_;
 }
 
 }  // namespace gfx