Update references to Blink's Platform API headers

cc/output/output_surface.h

 // Copyright 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 CC_OUTPUT_OUTPUT_SURFACE_H_
 #define CC_OUTPUT_OUTPUT_SURFACE_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/software_output_device.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
+#include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
 
 namespace gfx {
 class Rect;
 class Size;
 }
 
 namespace cc {
 
 class CompositorFrame;
 class OutputSurfaceClient;
@@ skipping 89 matching lines @@
 
   scoped_ptr<OutputSurfaceCallbacks> callbacks_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(OutputSurface);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OUTPUT_SURFACE_H_