Remove source line tracking from MediaList and related DevTools code

Source/core/css/CSSGrammar.y.in

Index: Source/core/css/CSSGrammar.y.in
diff --git a/Source/core/css/CSSGrammar.y.in b/Source/core/css/CSSGrammar.y.in
index 9a4c5db224f44c570c8b782107d5d87697342248..bdf408c5aee34c6d1b757edd149b32a5ac297408 100644
--- a/Source/core/css/CSSGrammar.y.in
+++ b/Source/core/css/CSSGrammar.y.in
@@ -653,17 +653,14 @@ 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($$);
     }
     ;