WebGraphicsContext3DCommandBufferImpl cleanup, Canvas2D thottling fix, GpuScheduler fix.

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h

Index: content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
diff --git a/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h b/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
index 84a4706b316fa197aa1dd1c1396f8c43f69ba75f..c9eabeb0d960f952618acf024b7e98361563d174 100644
--- a/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
+++ b/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
@@ -421,11 +421,6 @@ class WebGraphicsContext3DCommandBufferImpl
       WGC3Denum target, WGC3Dsizei samples, WGC3Denum internalformat,
       WGC3Dsizei width, WGC3Dsizei height);
 
-  virtual WebGLId createCompositorTexture(WGC3Dsizei width, WGC3Dsizei height);
-  virtual void deleteCompositorTexture(WebGLId parent_texture);
-  virtual void copyTextureToCompositor(WebGLId texture,
-                                       WebGLId parent_texture);
-
   RendererGLContext* context() { return context_; }
 
   virtual void setContextLostCallback(