Remove default begin frame sources from the renderer

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 57ea8fdc8f942d4a3c061aa1244abc01fa39fb44..04eee53b03a9cf0241632bf00fa263df78edbc03 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -2360,13 +2360,6 @@ bool LayerTreeHostImpl::InitializeRenderer(OutputSurface* output_surface) {
   CreateTileManagerResources();
   RecreateTreeResources();
 
-  // Initialize vsync parameters to sane values.
-  const base::TimeDelta display_refresh_interval =
-      base::TimeDelta::FromMicroseconds(
-          base::Time::kMicrosecondsPerSecond /
-          settings_.renderer_settings.refresh_rate);
-  CommitVSyncParameters(base::TimeTicks(), display_refresh_interval);
-
   // TODO(brianderson): Don't use a hard-coded parent draw time.
   base::TimeDelta parent_draw_time =
       (!settings_.use_external_begin_frame_source &&
@@ -2387,11 +2380,6 @@ bool LayerTreeHostImpl::InitializeRenderer(OutputSurface* output_surface) {
   return true;
 }
 
-void LayerTreeHostImpl::CommitVSyncParameters(base::TimeTicks timebase,
-                                              base::TimeDelta interval) {
-  client_->CommitVSyncParameters(timebase, interval);
-}
-
 void LayerTreeHostImpl::SetBeginFrameSource(BeginFrameSource* source) {
   client_->SetBeginFrameSource(source);
 }