Fix attribute selectors.

sky/engine/core/css/parser/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 786 matching lines @@
         $$ = parser->createFloatingSelector();
         $$->setMatch(CSSSelector::Class);
         if (isQuirksModeBehavior(parser->m_context.mode()))
             parser->tokenToLowerCase($2);
         $$->setValue($2);
     }
   ;
 
 attr_name:
     IDENT maybe_space {
-        if (parser->m_context.isHTMLDocument())
-            parser->tokenToLowerCase($1);
         $$ = $1;
     }
     ;
 
 attr_match_type:
     IDENT maybe_space {
         CSSSelector::AttributeMatchType attrMatchType = CSSSelector::CaseSensitive;
         if (!parser->parseAttributeMatchType(attrMatchType, $1))
             YYERROR;
         $$ = attrMatchType;
@@ skipping 494 matching lines @@
     ;
 
 rule_error_recovery:
     /* empty */
   | rule_error_recovery error
   | rule_error_recovery invalid_square_brackets_block
   | rule_error_recovery invalid_parentheses_block
     ;
 
 %%