Remove CSSCharsetRule

Source/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 448 matching lines @@
 closing_square_bracket:
     ']'
   | %prec LOWEST_PREC TOKEN_EOF
   ;
 
 semi_or_eof:
     ';'
   | TOKEN_EOF
   ;
 
-before_charset_rule:
-  /* empty */ {
-      parser->startRule();
-      parser->startRuleHeader(CSSRuleSourceData::CHARSET_RULE);
-  }
-
 maybe_charset:
     /* empty */
-  | before_charset_rule CHARSET_SYM maybe_space STRING maybe_space semi_or_eof {
-       if (parser->m_styleSheet)
-           parser->m_styleSheet->parserSetEncodingFromCharsetRule($4);
-       parser->endRuleHeader();
-       parser->startRuleBody();
-       parser->endRule(true);
-    }
-  | before_charset_rule CHARSET_SYM at_rule_recovery {
-       parser->endRule(false);
-  }
+  | CHARSET_SYM maybe_space STRING maybe_space semi_or_eof
+  | CHARSET_SYM at_rule_recovery
   ;
 
 rule_list:
    /* empty */
  | rule_list rule maybe_sgml {
      if ($2 && parser->m_styleSheet)
          parser->m_styleSheet->parserAppendRule($2);
  }
  ;
 
@@ skipping 1359 matching lines @@
     ;
 
 rule_error_recovery:
     /* empty */
   | rule_error_recovery error
   | rule_error_recovery invalid_square_brackets_block
   | rule_error_recovery invalid_parentheses_block
     ;
 
 %%