Decouple BrowserCompositorOutputSurface from BeginFrameSource.

content/browser/compositor/gpu_browser_compositor_output_surface.cc

Index: content/browser/compositor/gpu_browser_compositor_output_surface.cc
diff --git a/content/browser/compositor/gpu_browser_compositor_output_surface.cc b/content/browser/compositor/gpu_browser_compositor_output_surface.cc
index 5043c54d2b825ec4786770ba0adc1eec4f042b3d..e6992f5afb2f2937bdf46379fc8d096da5459ae8 100644
--- a/content/browser/compositor/gpu_browser_compositor_output_surface.cc
+++ b/content/browser/compositor/gpu_browser_compositor_output_surface.cc
@@ -23,12 +23,10 @@ namespace content {
 GpuBrowserCompositorOutputSurface::GpuBrowserCompositorOutputSurface(
     scoped_refptr<ContextProviderCommandBuffer> context,
     scoped_refptr<ui::CompositorVSyncManager> vsync_manager,
-    cc::SyntheticBeginFrameSource* begin_frame_source,
     std::unique_ptr<display_compositor::CompositorOverlayCandidateValidator>
         overlay_candidate_validator)
     : BrowserCompositorOutputSurface(std::move(context),
                                      std::move(vsync_manager),
-                                     begin_frame_source,
                                      std::move(overlay_candidate_validator)),
       weak_ptr_factory_(this) {
   if (capabilities_.uses_default_gl_framebuffer) {