Get rid of virtual Display::CreateScheduler.

cc/test/pixel_test_output_surface.h

Index: cc/test/pixel_test_output_surface.h
diff --git a/cc/test/pixel_test_output_surface.h b/cc/test/pixel_test_output_surface.h
index 6cd4191adedce7b7eb7b77f905198a3188fa6865..b18e69fa21af4c4704899439147455a3a7006475 100644
--- a/cc/test/pixel_test_output_surface.h
+++ b/cc/test/pixel_test_output_surface.h
@@ -9,25 +9,19 @@
 
 namespace cc {
 
-class BeginFrameSource;
-
 class PixelTestOutputSurface : public OutputSurface {
  public:
   explicit PixelTestOutputSurface(
       scoped_refptr<ContextProvider> context_provider,
       scoped_refptr<ContextProvider> worker_context_provider,
-      bool flipped_output_surface,
-      std::unique_ptr<BeginFrameSource> begin_frame_source);
+      bool flipped_output_surface);
   explicit PixelTestOutputSurface(
       scoped_refptr<ContextProvider> context_provider,
-      bool flipped_output_surface,
-      std::unique_ptr<BeginFrameSource> begin_frame_source);
+      bool flipped_output_surface);
   explicit PixelTestOutputSurface(
-      std::unique_ptr<SoftwareOutputDevice> software_device,
-      std::unique_ptr<BeginFrameSource> begin_frame_source);
+      std::unique_ptr<SoftwareOutputDevice> software_device);
   ~PixelTestOutputSurface() override;
 
-  bool BindToClient(OutputSurfaceClient* client) override;
   void Reshape(const gfx::Size& size, float scale_factor, bool alpha) override;
   bool HasExternalStencilTest() const override;
   void SwapBuffers(CompositorFrame* frame) override;
@@ -40,7 +34,6 @@ class PixelTestOutputSurface : public OutputSurface {
   }
 
  private:
-  std::unique_ptr<BeginFrameSource> begin_frame_source_;
   gfx::Size surface_expansion_size_;
   bool external_stencil_test_;
 };