Remove WebGraphicsContext3D getter from cc::ContextProvider

cc/output/gl_renderer.h

Index: cc/output/gl_renderer.h
diff --git a/cc/output/gl_renderer.h b/cc/output/gl_renderer.h
index cf672f0afa466abe044e6f7af9246c55da28b182..c915cff3b0c921afd11d8386afae4bc7f0622e95 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -23,8 +23,6 @@
 
 class SkBitmap;
 
-namespace blink { class WebGraphicsContext3D; }
-
 namespace gpu {
 namespace gles2 {
 class GLES2Interface;
@@ -58,8 +56,6 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
 
   virtual const RendererCapabilities& Capabilities() const OVERRIDE;
 
-  blink::WebGraphicsContext3D* Context();
-
   // Waits for rendering to finish.
   virtual void Finish() OVERRIDE;
 
@@ -399,7 +395,6 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
   SolidColorProgram solid_color_program_;
   SolidColorProgramAA solid_color_program_aa_;
 
-  blink::WebGraphicsContext3D* context_;
   gpu::gles2::GLES2Interface* gl_;
   gpu::ContextSupport* context_support_;