Rename WebCore namespace to blink in Platform

Source/platform/graphics/OpaqueRectTrackingContentLayerDelegate.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "platform/EventTracer.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/transforms/AffineTransform.h"
 #include "public/platform/WebFloatRect.h"
 #include "public/platform/WebRect.h"
 
 using blink::WebFloatRect;
 using blink::WebRect;
 
-namespace WebCore {
+namespace blink {
 
 OpaqueRectTrackingContentLayerDelegate::OpaqueRectTrackingContentLayerDelegate(GraphicsContextPainter* painter)
     : m_painter(painter)
     , m_opaque(false)
 {
 }
 
 OpaqueRectTrackingContentLayerDelegate::~OpaqueRectTrackingContentLayerDelegate()
 {
 }
@@ skipping 21 matching lines @@
 
     m_painter->paint(context, clip);
 
     // Transform tracked opaque paints back to our layer's content space.
     ASSERT(canvasToContentTransform.isInvertible());
     ASSERT(canvasToContentTransform.preservesAxisAlignment());
     opaque = canvasToContentTransform.mapRect(context.opaqueRegion().asRect());
 }
 
 }