Clean up remaining uses of WebCore namespace

Source/platform/graphics/RecordingImageBufferSurface.h

 // Copyright 2014 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 RecordingImageBufferSurface_h
 #define RecordingImageBufferSurface_h
 
 #include "platform/graphics/ImageBufferSurface.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/RefPtr.h"
 
 class SkPicture;
 class SkPictureRecorder;
 class RecordingImageBufferSurfaceTest;
 
-namespace WebCore {
+namespace blink {
 
 class GraphicsContext;
 
 class PLATFORM_EXPORT RecordingImageBufferSurface : public ImageBufferSurface {
     WTF_MAKE_NONCOPYABLE(RecordingImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
 public:
     RecordingImageBufferSurface(const IntSize&, OpacityMode = NonOpaque);
     virtual ~RecordingImageBufferSurface();
 
     // Implementation of ImageBufferSurface interfaces
@@ skipping 13 matching lines @@
 
     OwnPtr<SkPictureRecorder> m_currentFrame;
     RefPtr<SkPicture> m_previousFrame;
     OwnPtr<SkCanvas> m_rasterCanvas;
     GraphicsContext* m_graphicsContext;
     int m_initialSaveCount;
     bool m_frameWasCleared;
     bool m_surfaceUsedSincePreviousFrameWasPresented;
 };
 
-} // namespace WebCore
+} // namespace blink
 
 #endif