Removing using declarations that import names in the C++ Standard library.

Source/core/css/PropertySetCSSStyleDeclaration.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. 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.
  *
@@ skipping 15 matching lines @@
 #include "core/HTMLNames.h"
 #include "core/css/parser/BisonCSSParser.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/StylePropertySet.h"
 #include "core/dom/Element.h"
 #include "core/dom/MutationObserverInterestGroup.h"
 #include "core/dom/MutationRecord.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
-using namespace std;
-
 namespace WebCore {
 
 namespace {
 
 class StyleAttributeMutationScope {
     WTF_MAKE_NONCOPYABLE(StyleAttributeMutationScope);
     STACK_ALLOCATED();
 public:
     StyleAttributeMutationScope(AbstractPropertySetCSSStyleDeclaration* decl)
     {
@@ skipping 373 matching lines @@
 }
 #endif
 
 void InlineCSSStyleDeclaration::trace(Visitor* visitor)
 {
     visitor->trace(m_parentElement);
     AbstractPropertySetCSSStyleDeclaration::trace(visitor);
 }
 
 } // namespace WebCore