Mac Overlays: Add GPU back-pressure

ui/gl/gl_gl_api_implementation.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_gl_api_implementation.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 596 matching lines @@
 }
 
 void VirtualGLApi::glFlushFn() {
   GLApiBase::glFlushFn();
 }
 
 void VirtualGLApi::glFinishFn() {
   GLApiBase::glFinishFn();
 }
 
-ScopedSetGLToRealGLApi::ScopedSetGLToRealGLApi()
-    : old_gl_api_(GetCurrentGLApi()) {
-  SetGLToRealGLApi();
-}
-
-ScopedSetGLToRealGLApi::~ScopedSetGLToRealGLApi() {
-  SetGLApi(old_gl_api_);
-}
-
 }  // namespace gfx