Make Mac swap code like other platforms

content/browser/gpu/gpu_process_host_ui_shim.h

 // 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.
 
 #ifndef CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 #define CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 
 // This class lives on the UI thread and supports classes like the
 // BackingStoreProxy, which must live on the UI thread. The IO thread
 // portion of this class, the GpuProcessHost, is responsible for
@@ skipping 75 matching lines @@
   CONTENT_EXPORT void SimulateRemoveAllContext();
   CONTENT_EXPORT void SimulateCrash();
   CONTENT_EXPORT void SimulateHang();
 
  private:
   explicit GpuProcessHostUIShim(int host_id);
   ~GpuProcessHostUIShim() override;
 
   // Message handlers.
   bool OnControlMessageReceived(const IPC::Message& message);
-
   void OnLogMessage(int level, const std::string& header,
       const std::string& message);
-
   void OnGraphicsInfoCollected(const gpu::GPUInfo& gpu_info);
-
-#if defined(OS_MACOSX)
-  void OnAcceleratedSurfaceBuffersSwapped(
-      const AcceleratedSurfaceBuffersSwappedParams& params);
-#endif
   void OnVideoMemoryUsageStatsReceived(
       const gpu::VideoMemoryUsageStats& video_memory_usage_stats);
 
   // The serial number of the GpuProcessHost / GpuProcessHostUIShim pair.
   int host_id_;
   base::Closure close_callback_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_