Remove source line tracking from MediaList and related DevTools code

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 635 matching lines @@
     /* empty */ {
         $$ = parser->createMediaQuerySet();
     }
     | media_list
     ;
 
 media_list:
     media_query {
         $$ = parser->createMediaQuerySet();
         $$->addMediaQuery(parser->sinkFloatingMediaQuery($1));
-        parser->updateLastMediaLine($$);
     }
     | mq_list media_query {
         $$ = $1;
         $$->addMediaQuery(parser->sinkFloatingMediaQuery($2));
-        parser->updateLastMediaLine($$);
     }
     | mq_list {
         $$ = $1;
         $$->addMediaQuery(parser->sinkFloatingMediaQuery(parser->createFloatingNotAllQuery()));
-        parser->updateLastMediaLine($$);
     }
     ;
 
 mq_list:
     media_query ',' maybe_space {
         $$ = parser->createMediaQuerySet();
         $$->addMediaQuery(parser->sinkFloatingMediaQuery($1));
     }
     | mq_list media_query ',' maybe_space {
         $$ = $1;
@@ skipping 1192 matching lines @@
 
 rule_error_recovery:
     /* empty */
   | rule_error_recovery error
   | rule_error_recovery invalid_square_brackets_block
   | rule_error_recovery invalid_parentheses_block
     ;
 
 %%