content: Remove blimp compositing dependencies.

content/renderer/gpu/render_widget_compositor_delegate.h

Index: content/renderer/gpu/render_widget_compositor_delegate.h
diff --git a/content/renderer/gpu/render_widget_compositor_delegate.h b/content/renderer/gpu/render_widget_compositor_delegate.h
index 6dc198c8f5dcd6953a1bf29f2353ce49b4aab253..d157ed658006f891bb10444218542c4402869ac1 100644
--- a/content/renderer/gpu/render_widget_compositor_delegate.h
+++ b/content/renderer/gpu/render_widget_compositor_delegate.h
@@ -57,10 +57,6 @@ class CONTENT_EXPORT RenderWidgetCompositorDelegate {
   // will be displayed.
   virtual void DidReceiveCompositorFrameAck() = 0;
 
-  // Called by the compositor to forward a proto that represents serialized
-  // compositor state.
-  virtual void ForwardCompositorProto(const std::vector<uint8_t>& proto) = 0;
-
   // Indicates whether the RenderWidgetCompositor is about to close.
   virtual bool IsClosing() const = 0;