Decouple BrowserCompositorOutputSurface from BeginFrameSource.

content/browser/compositor/browser_compositor_output_surface.h

Index: content/browser/compositor/browser_compositor_output_surface.h
diff --git a/content/browser/compositor/browser_compositor_output_surface.h b/content/browser/compositor/browser_compositor_output_surface.h
index e049e4d1bb5ffdc57dd60b7985f4e87c97493628..1117aac1b0f940f46268aeada1ff6fab3b9a780c 100644
--- a/content/browser/compositor/browser_compositor_output_surface.h
+++ b/content/browser/compositor/browser_compositor_output_surface.h
@@ -14,7 +14,6 @@
 
 namespace cc {
 class SoftwareOutputDevice;
-class SyntheticBeginFrameSource;
 }
 
 namespace display_compositor {
@@ -55,24 +54,20 @@ class CONTENT_EXPORT BrowserCompositorOutputSurface
   BrowserCompositorOutputSurface(
       scoped_refptr<cc::ContextProvider> context,
       scoped_refptr<ui::CompositorVSyncManager> vsync_manager,
-      cc::SyntheticBeginFrameSource* begin_frame_source,
       std::unique_ptr<display_compositor::CompositorOverlayCandidateValidator>
           overlay_candidate_validator);
 
   // Constructor used by the software implementation.
   BrowserCompositorOutputSurface(
       std::unique_ptr<cc::SoftwareOutputDevice> software_device,
-      const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
-      cc::SyntheticBeginFrameSource* begin_frame_source);
+      const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager);
 
   // Constructor used by the Vulkan implementation.
   BrowserCompositorOutputSurface(
       const scoped_refptr<cc::VulkanContextProvider>& vulkan_context_provider,
-      const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
-      cc::SyntheticBeginFrameSource* begin_frame_source);
+      const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager);
 
   scoped_refptr<ui::CompositorVSyncManager> vsync_manager_;
-  cc::SyntheticBeginFrameSource* synthetic_begin_frame_source_;
   ReflectorImpl* reflector_;
 
  private: