pepper: Use the RenderThread's shared context as the parent context.

content/renderer/pepper/pepper_parent_context_provider.h

-// Copyright (c) 2012 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 CONTENT_RENDERER_PEPPER_PEPPER_PARENT_CONTEXT_PROVIDER_H_
-#define CONTENT_RENDERER_PEPPER_PEPPER_PARENT_CONTEXT_PROVIDER_H_
-
-#include "base/basictypes.h"
-
-namespace content {
-class WebGraphicsContext3DCommandBufferImpl;
-
-// Defines the mechanism by which a Pepper 3D context fetches its
-// parent context for display to the screen.
-class PepperParentContextProvider {
- public:
-  virtual WebGraphicsContext3DCommandBufferImpl*
-      GetParentContextForPlatformContext3D() = 0;
-
- protected:
-  PepperParentContextProvider();
-  virtual ~PepperParentContextProvider();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PepperParentContextProvider);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_PEPPER_PEPPER_PARENT_CONTEXT_PROVIDER_H_