Mac: Fix bad framerate when capturing tab

content/browser/renderer_host/compositing_iosurface_context_mac.h

 // Copyright (c) 2013 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_CONTEXT_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_CONTEXT_MAC_H_
 
 #import <AppKit/NSOpenGL.h>
 #include <OpenGL/OpenGL.h>
 #include <map>
@@ skipping 32 matching lines @@
   // invalid, so they shouldn't be returned anymore by Get, but rather, new
   // contexts should be created. This is called as a precaution when unexpected
   // GL errors occur.
   void PoisonContextAndSharegroup();
   bool HasBeenPoisoned() const { return poisoned_; }
 
   CompositingIOSurfaceShaderPrograms* shader_program_cache() const {
     return shader_program_cache_.get();
   }
   CGLContextObj cgl_context() const { return cgl_context_; }
-  bool is_vsync_disabled() const { return is_vsync_disabled_; }
   int window_number() const { return window_number_; }
 
   // content::GpuDataManagerObserver implementation.
   virtual void OnGpuSwitching() OVERRIDE;
 
  private:
   friend class base::RefCounted<CompositingIOSurfaceContext>;
 
   CompositingIOSurfaceContext(
       int window_number,
       base::ScopedTypeRef<CGLContextObj> clg_context_strong,
       CGLContextObj clg_context,
-      bool is_vsync_disabled_,
       scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache);
   virtual ~CompositingIOSurfaceContext();
 
   int window_number_;
   base::ScopedTypeRef<CGLContextObj> cgl_context_strong_;
   // Weak, backed by |cgl_context_strong_|.
   CGLContextObj cgl_context_;
 
-  bool is_vsync_disabled_;
   scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache_;
   bool poisoned_;
 
   // The global map from window number and window ordering to
   // context data.
   typedef std::map<int, CompositingIOSurfaceContext*> WindowMap;
   static base::LazyInstance<WindowMap> window_map_;
   static WindowMap* window_map();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_CONTEXT_MAC_H_