Stop using WebCore namespace in generated code

Source/core/css/CSSGrammar.y

 %{
 
 /*
  *  Copyright (C) 2002-2003 Lars Knoll (knoll@kde.org)
  *  Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  *  Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *  Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  *  Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
@@ skipping 25 matching lines @@
 #include "core/css/CSSSelectorList.h"
 #include "core/css/MediaList.h"
 #include "core/css/MediaQueryExp.h"
 #include "core/css/StyleRule.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/Document.h"
 #include "wtf/FastMalloc.h"
 #include <stdlib.h>
 #include <string.h>
 
-using namespace WebCore;
+using namespace blink;
 using namespace HTMLNames;
 
 #define YYMALLOC fastMalloc
 #define YYFREE fastFree
 
 #define YYENABLE_NLS 0
 #define YYLTYPE_IS_TRIVIAL 1
 #define YYMAXDEPTH 10000
 #define YYDEBUG 0
 
@@ skipping 1766 matching lines @@
     ;
 
 rule_error_recovery:
     /* empty */
   | rule_error_recovery error
   | rule_error_recovery invalid_square_brackets_block
   | rule_error_recovery invalid_parentheses_block
     ;
 
 %%