Cleanup namespace usage in public/platform/{Web[P-W]*,linux/*}.h

public/platform/WebScrollbar.h

 /*
  * 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 16 matching lines @@
 
 #include "WebPoint.h"
 #include "WebRect.h"
 #include "WebSize.h"
 #include "WebVector.h"
 #if INSIDE_BLINK
 #include "wtf/PassOwnPtr.h"
 #endif
 
 namespace blink {
-class Scrollbar;
-}
-
-namespace blink {
 
 // A const accessor interface for a WebKit scrollbar
 class BLINK_PLATFORM_EXPORT WebScrollbar {
 public:
     enum Orientation {
         Horizontal,
         Vertical
     };
 
     enum ScrollDirection {
@@ skipping 56 matching lines @@
     virtual bool isCustomScrollbar() const = 0;
     virtual Orientation orientation() const = 0;
     virtual bool isLeftSideVerticalScrollbar() const = 0;
     virtual bool isAlphaLocked() const { return false; }
     virtual void setIsAlphaLocked(bool) { }
 };
 
 } // namespace blink
 
 #endif