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

Source/core/platform/Scrollbar.h

 /*
  * Copyright (C) 2004, 2006 Apple Computer, 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 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
 #ifndef Scrollbar_h
 #define Scrollbar_h
 
 #include "core/platform/ScrollTypes.h"
 #include "core/platform/ScrollbarThemeClient.h"
 #include "core/platform/Timer.h"
 #include "core/platform/Widget.h"
-#include <wtf/MathExtras.h>
-#include <wtf/PassRefPtr.h>
+#include "wtf/MathExtras.h"
+#include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
 class GraphicsContext;
 class IntRect;
 class PlatformGestureEvent;
 class PlatformMouseEvent;
 class ScrollableArea;
 class ScrollbarTheme;
 
@@ skipping 154 matching lines @@
     bool m_isAlphaLocked;
 
 private:
     virtual bool isScrollbar() const { return true; }
     virtual AXObjectCache* existingAXObjectCache() const;
 };
 
 } // namespace WebCore
 
 #endif // Scrollbar_h