cc: Make single-thread renderer compositor always synchronous.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 5ade8f03cf2a9939a9506b437f6bfc452e522b77..4257dcf45a1623a19ccf11c15035575213966da4 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1414,12 +1414,6 @@ bool RenderThreadImpl::IsElasticOverscrollEnabled() {
   return is_elastic_overscroll_enabled_;
 }
 
-bool RenderThreadImpl::UseSingleThreadScheduler() {
-  // TODO(enne): using the scheduler introduces additional composite steps
-  // that create flakiness.  This should go away eventually.
-  return !layout_test_mode_;
-}
-
 uint32 RenderThreadImpl::GetImageTextureTarget() {
   return use_image_texture_target_;
 }