Move ReferencedSurfaceTracker into GpuCompositorFrameSink.

content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc

Index: content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc
diff --git a/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc b/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc
index 5717d03773b2bb1f13af95819701a97a1cee8a5e..c0409911d5be6d7280b862d340d1f7044089a8ae 100644
--- a/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc
+++ b/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc
@@ -40,21 +40,11 @@ void OffscreenCanvasCompositorFrameSink::SetNeedsBeginFrame(
 void OffscreenCanvasCompositorFrameSink::SubmitCompositorFrame(
     const cc::LocalFrameId& local_frame_id,
     cc::CompositorFrame frame) {
+  // TODO(samans): This will need to do something similar to
+  // GpuCompositorFrameSink.
   support_.SubmitCompositorFrame(local_frame_id, std::move(frame));
 }
 
-void OffscreenCanvasCompositorFrameSink::AddSurfaceReferences(
-    const std::vector<cc::SurfaceReference>& references) {
-  // TODO(fsamuel, staraz): Implement this.
-  NOTIMPLEMENTED();
-}
-
-void OffscreenCanvasCompositorFrameSink::RemoveSurfaceReferences(
-    const std::vector<cc::SurfaceReference>& references) {
-  // TODO(fsamuel, staraz): Implement this.
-  NOTIMPLEMENTED();
-}
-
 void OffscreenCanvasCompositorFrameSink::EvictFrame() {
   support_.EvictFrame();
 }