Unprefix the @viewport rule of CSS Device Adaptation spec

Source/core/css/CSSGrammar.y.in

 /*
  *  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
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 106 matching lines @@
 
 %token IMPORT_SYM
 %token PAGE_SYM
 %token MEDIA_SYM
 %token SUPPORTS_SYM
 %token FONT_FACE_SYM
 %token HOST_SYM
 %token CHARSET_SYM
 %token NAMESPACE_SYM
 %token VARFUNCTION
+%token VIEWPORT_RULE_SYM
 %token INTERNAL_DECLS_SYM
 %token INTERNAL_RULE_SYM
 %token INTERNAL_SELECTOR_SYM
 %token INTERNAL_VALUE_SYM
 %token WEBKIT_KEYFRAME_RULE_SYM
 %token WEBKIT_KEYFRAMES_SYM
 %token WEBKIT_MEDIAQUERY_SYM
 %token WEBKIT_REGION_RULE_SYM
-%token WEBKIT_VIEWPORT_RULE_SYM
 %token WEBKIT_SUPPORTS_CONDITION_SYM
 %token WEBKIT_FILTER_RULE_SYM
 %token <marginBox> TOPLEFTCORNER_SYM
 %token <marginBox> TOPLEFT_SYM
 %token <marginBox> TOPCENTER_SYM
 %token <marginBox> TOPRIGHT_SYM
 %token <marginBox> TOPRIGHTCORNER_SYM
 %token <marginBox> BOTTOMLEFTCORNER_SYM
 %token <marginBox> BOTTOMLEFT_SYM
 %token <marginBox> BOTTOMCENTER_SYM
@@ skipping 870 matching lines @@
     ;
 
 before_viewport_rule:
     /* empty */ {
         parser->markViewportRuleBodyStart();
         parser->startRuleHeader(CSSRuleSourceData::VIEWPORT_RULE);
     }
     ;
 
 viewport:
-    before_viewport_rule WEBKIT_VIEWPORT_RULE_SYM at_rule_header_end_maybe_space
+    before_viewport_rule VIEWPORT_RULE_SYM at_rule_header_end_maybe_space
     '{' at_rule_body_start maybe_space_before_declaration declaration_list closing_brace {
         $$ = parser->createViewportRule();
         parser->markViewportRuleBodyEnd();
     }
-    | before_viewport_rule WEBKIT_VIEWPORT_RULE_SYM at_rule_recovery {
+    | before_viewport_rule VIEWPORT_RULE_SYM at_rule_recovery {
         $$ = 0;
         parser->endRuleBody(true);
         parser->markViewportRuleBodyEnd();
     }
 ;
 
 region_selector:
     selector_list {
         if ($1) {
             parser->setReusableRegionSelectorVector($1);
@@ skipping 914 matching lines @@
 
 rule_error_recovery:
     /* empty */
   | rule_error_recovery error
   | rule_error_recovery invalid_square_brackets_block
   | rule_error_recovery invalid_parentheses_block
     ;
 
 %%