cc: Delete the Renderer base class.

cc/output/software_renderer.h

Index: cc/output/software_renderer.h
diff --git a/cc/output/software_renderer.h b/cc/output/software_renderer.h
index c7e0f809d43fd3171f34b0f069b3e115ebfb16d4..ff5ea508e92b568274654ec9de52e01a1d2043a3 100644
--- a/cc/output/software_renderer.h
+++ b/cc/output/software_renderer.h
@@ -13,7 +13,6 @@
 namespace cc {
 
 class OutputSurface;
-class RendererClient;
 class ResourceProvider;
 class SoftwareOutputDevice;
 
@@ -27,17 +26,14 @@ class TileDrawQuad;
 class CC_EXPORT SoftwareRenderer : public DirectRenderer {
  public:
   static std::unique_ptr<SoftwareRenderer> Create(
-      RendererClient* client,
+      DirectRendererClient* client,
       const RendererSettings* settings,
       OutputSurface* output_surface,
       ResourceProvider* resource_provider);
 
   ~SoftwareRenderer() override;
   const RendererCapabilitiesImpl& Capabilities() const override;
-  void Finish() override;
   void SwapBuffers(CompositorFrameMetadata metadata) override;
-  void DiscardBackbuffer() override;
-  void EnsureBackbuffer() override;
 
   void SetDisablePictureQuadImageFiltering(bool disable) {
     disable_picture_quad_image_filtering_ = disable;
@@ -64,13 +60,11 @@ class CC_EXPORT SoftwareRenderer : public DirectRenderer {
       DrawingFrame* frame,
       std::unique_ptr<CopyOutputRequest> request) override;
 
-  SoftwareRenderer(RendererClient* client,
+  SoftwareRenderer(DirectRendererClient* client,
                    const RendererSettings* settings,
                    OutputSurface* output_surface,
                    ResourceProvider* resource_provider);
 
-  void DidChangeVisibility() override;
-
  private:
   void ClearCanvas(SkColor color);
   void ClearFramebuffer(DrawingFrame* frame);
@@ -110,7 +104,6 @@ class CC_EXPORT SoftwareRenderer : public DirectRenderer {
 
   RendererCapabilitiesImpl capabilities_;
   bool is_scissor_enabled_;
-  bool is_backbuffer_discarded_;
   gfx::Rect scissor_rect_;
 
   SoftwareOutputDevice* output_device_;