cc: Remove FinishAllRendering, as it doesn't do anything anymore.

cc/output/gl_renderer.h

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_OUTPUT_GL_RENDERER_H_
 #define CC_OUTPUT_GL_RENDERER_H_
 
 #include <deque>
 #include <vector>
 
@@ skipping 44 matching lines @@
       const RendererSettings* settings,
       OutputSurface* output_surface,
       ResourceProvider* resource_provider,
       TextureMailboxDeleter* texture_mailbox_deleter,
       int highp_threshold_min);
 
   ~GLRenderer() override;
 
   const RendererCapabilitiesImpl& Capabilities() const override;
 
-  // Waits for rendering to finish.
-  void Finish() override;
-
   void SwapBuffers(CompositorFrameMetadata metadata) override;
   void SwapBuffersComplete() override;
 
   void DidReceiveTextureInUseResponses(
       const gpu::TextureInUseResponses& responses) override;
 
   virtual bool IsContextLost();
 
  protected:
   GLRenderer(RendererClient* client,
@@ skipping 480 matching lines @@
   // FlippedFramebuffer to return |true|.
   bool force_drawing_frame_framebuffer_unflipped_ = false;
 
   BoundGeometry bound_geometry_;
   DISALLOW_COPY_AND_ASSIGN(GLRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_GL_RENDERER_H_