Cleanup namespace usage in Source/web/Web[I-Z]*.cpp

Source/web/WebTextAreaElement.cpp

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #include "config.h"
 #include "public/web/WebTextAreaElement.h"
 
 #include "core/HTMLNames.h"
 #include "core/html/HTMLTextAreaElement.h"
 #include "public/platform/WebString.h"
 #include "wtf/PassRefPtr.h"
 
-using namespace blink;
-
 namespace blink {
 
 WebTextAreaElement::WebTextAreaElement(const PassRefPtrWillBeRawPtr<HTMLTextAreaElement>& element)
     : WebFormControlElement(element)
 {
 }
 
 WebTextAreaElement& WebTextAreaElement::operator=(const PassRefPtrWillBeRawPtr<HTMLTextAreaElement>& element)
 {
     m_private = element;
     return *this;
 }
 
 WebTextAreaElement::operator PassRefPtrWillBeRawPtr<HTMLTextAreaElement>() const
 {
     return toHTMLTextAreaElement(m_private.get());
 }
 
 } // namespace blink