Remove RuntimeEnabledFeatures flag MediaQueryParser (status=stable)

Source/core/css/parser/CSSGrammar.y

Index: Source/core/css/parser/CSSGrammar.y
diff --git a/Source/core/css/parser/CSSGrammar.y b/Source/core/css/parser/CSSGrammar.y
index 253597c94a0f14f2d641424bf26318d9683bbd4e..788bda86120ae8a1d4b6cb332860177f830084eb 100644
--- a/Source/core/css/parser/CSSGrammar.y
+++ b/Source/core/css/parser/CSSGrammar.y
@@ -188,7 +188,6 @@ inline static CSSParserValue makeIdentValue(CSSParserString string)
 %token NAMESPACE_SYM
 %token VIEWPORT_RULE_SYM
 %token INTERNAL_DECLS_SYM
-%token INTERNAL_MEDIALIST_SYM
 %token INTERNAL_RULE_SYM
 %token INTERNAL_SELECTOR_SYM
 %token INTERNAL_VALUE_SYM
@@ -380,7 +379,6 @@ stylesheet:
   | internal_rule
   | internal_selector
   | internal_value
-  | internal_medialist
   | internal_keyframe_rule
   | internal_keyframe_key_list
   | internal_supports_condition
@@ -420,12 +418,6 @@ internal_value:
     }
 ;
 
-internal_medialist:
-    INTERNAL_MEDIALIST_SYM maybe_space location_label maybe_media_list TOKEN_EOF {
-        parser->m_mediaList = $4;
-    }
-;
-
 internal_selector:
     INTERNAL_SELECTOR_SYM maybe_space selector_list TOKEN_EOF {
         if (parser->m_selectorListForParseSelector)