core/platform: Include wtf files using "wtf/foo.h" form.

Source/core/platform/graphics/Icon.h

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef Icon_h
 #define Icon_h
 
-#include <wtf/Forward.h>
-#include <wtf/PassRefPtr.h>
-#include <wtf/RefCounted.h>
-#include <wtf/Vector.h>
+#include "wtf/Forward.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefCounted.h"
+#include "wtf/Vector.h"
 
 #include "core/platform/graphics/Image.h"
 #include "core/platform/graphics/chromium/PlatformIcon.h"
 
 namespace WebCore {
 
 class GraphicsContext;
 class IntRect;
     
 class Icon : public RefCounted<Icon> {
 public:
     static PassRefPtr<Icon> createIconForFiles(const Vector<String>& filenames);
 
     ~Icon();
 
     void paint(GraphicsContext*, const IntRect&);
 
     static PassRefPtr<Icon> create(PassRefPtr<PlatformIcon> icon) { return adoptRef(new Icon(icon)); }
 
 private:
     Icon(PassRefPtr<PlatformIcon>);
     RefPtr<PlatformIcon> m_icon;
 };
 
 }
 
 #endif