Clean up Mac swap acknowledgement code

content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.h

 // Copyright 2014 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_COMPOSITOR_GPU_SURFACELESS_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_COMPOSITOR_GPU_SURFACELESS_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include "content/browser/compositor/gpu_browser_compositor_output_surface.h"
 
 namespace content {
@@ skipping 19 matching lines @@
 
  private:
   // cc::OutputSurface implementation.
   void SwapBuffers(cc::CompositorFrame* frame) override;
   void OnSwapBuffersComplete() override;
   void BindFramebuffer() override;
   void Reshape(const gfx::Size& size, float scale_factor) override;
   bool IsDisplayedAsOverlayPlane() const override;
   unsigned GetOverlayTextureId() const override;
 
-  void OnSwapBuffersCompleted(const std::vector<ui::LatencyInfo>& latency_info,
-                              gfx::SwapResult result) override;
-#if defined(OS_MACOSX)
-  void OnSurfaceDisplayed() override;
-#endif
+  // BrowserCompositorOutputSurface implementation.
+  void OnGpuSwapBuffersCompleted(
+      const std::vector<ui::LatencyInfo>& latency_info,
+      gfx::SwapResult result) override;
 
   unsigned int internalformat_;
   scoped_ptr<GLHelper> gl_helper_;
   scoped_ptr<BufferQueue> output_surface_;
   BrowserGpuMemoryBufferManager* gpu_memory_buffer_manager_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_GPU_SURFACELESS_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_