Removing "using" delclarations that import names from the STL library.

Source/core/accessibility/AXNodeObject.cpp

 /*
 * 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
@@ skipping 25 matching lines @@
 #include "core/html/HTMLFrameElementBase.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLLabelElement.h"
 #include "core/html/HTMLLegendElement.h"
 #include "core/html/HTMLSelectElement.h"
 #include "core/html/HTMLTextAreaElement.h"
 #include "core/rendering/RenderObject.h"
 #include "platform/UserGestureIndicator.h"
 #include "wtf/text/StringBuilder.h"
 
-using namespace std;
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 AXNodeObject::AXNodeObject(Node* node)
     : AXObject()
     , m_ariaRole(UnknownRole)
     , m_childrenDirty(false)
 #ifndef NDEBUG
@@ skipping 1732 matching lines @@
         useTextUnderElement = true;
 
     if (useTextUnderElement) {
         String text = textUnderElement();
         if (!text.isEmpty())
             textOrder.append(AccessibilityText(text, ChildrenText));
     }
 }
 
 } // namespace WebCore