Remove the Media Query "forward compatibly syntax" support in alignment with HTML5 spec

Source/core/css/MediaList.h

Index: Source/core/css/MediaList.h
diff --git a/Source/core/css/MediaList.h b/Source/core/css/MediaList.h
index 0b201ef7181dd6800d504676fdd0f1ed531449e6..554cba48a5b57db773a590d4581e7d8cc85db208 100644
--- a/Source/core/css/MediaList.h
+++ b/Source/core/css/MediaList.h
@@ -38,7 +38,6 @@ class MediaQuery;
 
 enum MediaQueryParserMode {
     MediaQueryNormalMode,
-    MediaQueryForwardCompatibleSyntaxMode,
     MediaQueryStrictMode,
 };
 
@@ -52,10 +51,6 @@ public:
     {
         return adoptRef(new MediaQuerySet(mediaString, MediaQueryNormalMode));
     }
-    static PassRefPtr<MediaQuerySet> createAllowingDescriptionSyntax(const String& mediaString)
-    {
-        return adoptRef(new MediaQuerySet(mediaString, MediaQueryForwardCompatibleSyntaxMode));
-    }
     ~MediaQuerySet();
 
     bool set(const String&);