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

third_party/WebKit/Source/core/editing/EditingStyle.cpp

 /*
  * Copyright (C) 2007, 2008, 2009 Apple Computer, Inc.
  * Copyright (C) 2010, 2011 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 47 matching lines @@
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLFontElement.h"
 #include "core/html/HTMLSpanElement.h"
 #include "core/layout/LayoutBox.h"
 #include "core/layout/LayoutObject.h"
 #include "core/style/ComputedStyle.h"
 #include "wtf/StdLibExtras.h"
 
 namespace blink {
 
+using namespace cssvalue;
+
 static const CSSPropertyID& textDecorationPropertyForEditing() {
   static const CSSPropertyID property =
       RuntimeEnabledFeatures::css3TextDecorationsEnabled()
           ? CSSPropertyTextDecorationLine
           : CSSPropertyTextDecoration;
   return property;
 }
 
 // Editing style properties must be preserved during editing operation.
 // e.g. when a user inserts a new paragraph, all properties listed here must be
@@ skipping 1690 matching lines @@
     const CSSIdentifierValue& identifierValue = toCSSIdentifierValue(*value);
     if (CSSValueXSmall <= identifierValue.getValueID() &&
         identifierValue.getValueID() <= CSSValueWebkitXxxLarge)
       return identifierValue.getValueID() - CSSValueXSmall + 1;
   }
 
   return 0;
 }
 
 }  // namespace blink