cc: Delete the RendererClient class.

cc/output/delegating_renderer.h

Index: cc/output/delegating_renderer.h
diff --git a/cc/output/delegating_renderer.h b/cc/output/delegating_renderer.h
index 7a77ce70a1305822cb2debded05fdafec043a47e..e9a2b5b8c0dbb959840afd56a90b42a50f06aea8 100644
--- a/cc/output/delegating_renderer.h
+++ b/cc/output/delegating_renderer.h
@@ -19,8 +19,7 @@ class ResourceProvider;
 
 class CC_EXPORT DelegatingRenderer : public Renderer {
  public:
-  DelegatingRenderer(RendererClient* client,
-                     const RendererSettings* settings,
+  DelegatingRenderer(const RendererSettings* settings,
                      OutputSurface* output_surface,
                      ResourceProvider* resource_provider);
   ~DelegatingRenderer() override;
@@ -37,8 +36,6 @@ class CC_EXPORT DelegatingRenderer : public Renderer {
   void ReclaimResources(const ReturnedResourceArray&) override;
 
  private:
-  void DidChangeVisibility() override {}
-
   OutputSurface* output_surface_;
   ResourceProvider* resource_provider_;
   RendererCapabilitiesImpl capabilities_;