Remove uses of external begin frame sources

content/renderer/gpu/compositor_dependencies.h

Index: content/renderer/gpu/compositor_dependencies.h
diff --git a/content/renderer/gpu/compositor_dependencies.h b/content/renderer/gpu/compositor_dependencies.h
index 0db1058f127497aa51c55ef97404dca46703c7ac..17458ecfaa9fd2d757485bb3150b50e115bfba20 100644
--- a/content/renderer/gpu/compositor_dependencies.h
+++ b/content/renderer/gpu/compositor_dependencies.h
@@ -57,10 +57,6 @@ class CompositorDependencies {
   virtual cc::SharedBitmapManager* GetSharedBitmapManager() = 0;
   virtual gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() = 0;
   virtual blink::scheduler::RendererScheduler* GetRendererScheduler() = 0;
-  // TODO(danakj): This should be part of RenderThreadImpl (or some API from it
-  // to RenderWidget). But RenderThreadImpl is null in RenderViewTest.
-  virtual std::unique_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource(
-      int routing_id) = 0;
   virtual cc::ImageSerializationProcessor* GetImageSerializationProcessor() = 0;
   virtual cc::TaskGraphRunner* GetTaskGraphRunner() = 0;
   virtual bool AreImageDecodeTasksEnabled() = 0;