Get rid of virtual Display::CreateScheduler.

cc/test/pixel_test_output_surface.cc

Index: cc/test/pixel_test_output_surface.cc
diff --git a/cc/test/pixel_test_output_surface.cc b/cc/test/pixel_test_output_surface.cc
index 96ab60d1a2709a8fd4e0ad3acdf125bba6e107b9..78393ff3eb201ad4858de1ee2ad0bcebb35d5e8f 100644
--- a/cc/test/pixel_test_output_surface.cc
+++ b/cc/test/pixel_test_output_surface.cc
@@ -44,17 +44,6 @@ PixelTestOutputSurface::PixelTestOutputSurface(
 
 PixelTestOutputSurface::~PixelTestOutputSurface() {}
 
-bool PixelTestOutputSurface::BindToClient(OutputSurfaceClient* client) {
-  if (!OutputSurface::BindToClient(client))
-    return false;
-
-  // TODO(enne): Once the renderer uses begin frame sources, this will
-  // always be valid.
-  if (begin_frame_source_)
-    client->SetBeginFrameSource(begin_frame_source_.get());
-  return true;
-}
-
 void PixelTestOutputSurface::Reshape(const gfx::Size& size,
                                      float scale_factor,
                                      bool has_alpha) {