Introduce the nested namespace ::blink::cssvalue, start with CSSColorValue.

third_party/WebKit/Source/core/html/HTMLHRElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2010 Apple Inc. 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 14 matching lines @@
 #include "core/CSSPropertyNames.h"
 #include "core/CSSValueKeywords.h"
 #include "core/HTMLNames.h"
 #include "core/css/CSSColorValue.h"
 #include "core/css/StylePropertySet.h"
 #include "core/html/HTMLOptGroupElement.h"
 #include "core/html/HTMLSelectElement.h"
 
 namespace blink {
 
+using namespace cssvalue;
 using namespace HTMLNames;
 
 inline HTMLHRElement::HTMLHRElement(Document& document)
     : HTMLElement(hrTag, document) {}
 
 DEFINE_NODE_FACTORY(HTMLHRElement)
 
 bool HTMLHRElement::isPresentationAttribute(const QualifiedName& name) const {
   if (name == alignAttr || name == widthAttr || name == colorAttr ||
       name == noshadeAttr || name == sizeAttr)
@@ skipping 91 matching lines @@
       toHTMLSelectElement(insertionPoint)->hrInsertedOrRemoved(*this);
   } else if (isHTMLOptGroupElement(*insertionPoint)) {
     Node* parent = insertionPoint->parentNode();
     if (isHTMLSelectElement(parent))
       toHTMLSelectElement(parent)->hrInsertedOrRemoved(*this);
   }
   HTMLElement::removedFrom(insertionPoint);
 }
 
 }  // namespace blink