Clean up remaining uses of WebCore namespace

Source/core/dom/DOMPoint.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 DOMPoint_h
 #define DOMPoint_h
 
 #include "bindings/core/v8/Dictionary.h"
 #include "core/dom/DOMPointReadOnly.h"
 
-namespace WebCore {
+namespace blink {
 
 class DOMPoint FINAL : public DOMPointReadOnly {
 public:
     static DOMPoint* create(const Dictionary&);
     static DOMPoint* create(double x, double y, double z = 0, double w = 1);
 
     void setX(double x) { m_x = x; }
     void setY(double y) { m_y = y; }
     void setZ(double z) { m_z = z; }
     void setW(double w) { m_w = w; }
 
 protected:
     DOMPoint(double x, double y, double z, double w);
 };
 
-} // namespace WebCore
+} // namespace blink
 
 #endif