cc: Get rid of PostSwapBuffersComplete.

content/browser/compositor/vulkan_browser_compositor_output_surface.h

 // Copyright (c) 2016 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_VULKAN_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_COMPOSITOR_VULKAN_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "content/browser/compositor/browser_compositor_output_surface.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace gpu {
 class VulkanSurface;
 }
 
 namespace content {
 
 class VulkanBrowserCompositorOutputSurface
     : public BrowserCompositorOutputSurface {
  public:
   VulkanBrowserCompositorOutputSurface(
-      const scoped_refptr<cc::VulkanContextProvider>& context,
-      const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
+      scoped_refptr<cc::VulkanContextProvider> context,
+      scoped_refptr<ui::CompositorVSyncManager> vsync_manager,
       cc::SyntheticBeginFrameSource* begin_frame_source);
 
   ~VulkanBrowserCompositorOutputSurface() override;
 
   bool Initialize(gfx::AcceleratedWidget widget);
   void Destroy();
 
   // BrowserCompositorOutputSurface implementation.
   void OnGpuSwapBuffersCompleted(
       const std::vector<ui::LatencyInfo>& latency_info,
       gfx::SwapResult result,
       const gpu::GpuProcessHostedCALayerTreeParamsMac* params_mac) override;
 
  protected:
   // cc::OutputSurface implementation.
   void SwapBuffers(cc::CompositorFrame* frame) override;
 
  private:
   std::unique_ptr<gpu::VulkanSurface> surface_;
 
   DISALLOW_COPY_AND_ASSIGN(VulkanBrowserCompositorOutputSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_VULKAN_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_