Rename cleanup in comments in css/ directory.

third_party/WebKit/Source/core/css/MediaQueryListEvent.h

Index: third_party/WebKit/Source/core/css/MediaQueryListEvent.h
diff --git a/third_party/WebKit/Source/core/css/MediaQueryListEvent.h b/third_party/WebKit/Source/core/css/MediaQueryListEvent.h
index 87c7b06f0cf3db6d4a980e73f271862114e80b8b..d9182f15ce602e3dac55d8a8f688faee0921c20d 100644
--- a/third_party/WebKit/Source/core/css/MediaQueryListEvent.h
+++ b/third_party/WebKit/Source/core/css/MediaQueryListEvent.h
@@ -65,7 +65,7 @@ class MediaQueryListEvent final : public Event {
       matches_ = initializer.matches();
   }
 
-  // We have m_media/m_matches for JS-created events; we use m_mediaQueryList
+  // We have media_/matches_ for JS-created events; we use media_query_list_
   // for events that blink generates.
   Member<MediaQueryList> media_query_list_;
   String media_;