Get rid of virtual Display::CreateScheduler.

content/browser/compositor/browser_compositor_output_surface.cc

Index: content/browser/compositor/browser_compositor_output_surface.cc
diff --git a/content/browser/compositor/browser_compositor_output_surface.cc b/content/browser/compositor/browser_compositor_output_surface.cc
index 66183edd4d410ba9af3b3ff621f29128581b135e..05d0016a01dac30a81fa2b11b7f7100f3c087347 100644
--- a/content/browser/compositor/browser_compositor_output_surface.cc
+++ b/content/browser/compositor/browser_compositor_output_surface.cc
@@ -88,9 +88,6 @@ bool BrowserCompositorOutputSurface::BindToClient(
   if (!OutputSurface::BindToClient(client))
     return false;
 
-  // Pass begin frame source up to Display to use for DisplayScheduler.
-  client->SetBeginFrameSource(synthetic_begin_frame_source_.get());
-
   // Don't want vsync notifications until there is a client.
   if (!use_begin_frame_scheduling_)
     vsync_manager_->AddObserver(this);
@@ -127,6 +124,11 @@ void BrowserCompositorOutputSurface::OnUpdateVSyncParametersFromGpu(
   vsync_manager_->UpdateVSyncParameters(timebase, interval);
 }
 
+cc::BeginFrameSource* BrowserCompositorOutputSurface::GetBeginFrameSource() {
+  // The BeginFrameSource for the Display and DisplayScheduler to use.
+  return synthetic_begin_frame_source_.get();
+}
+
 void BrowserCompositorOutputSurface::SetReflector(ReflectorImpl* reflector) {
   // Software mirroring is done by doing a GL copy out of the framebuffer - if
   // we have overlays then that data will be missing.