Cast: Deduplicate event types in cast library.

media/cast/logging/stats_event_subscriber.h

Index: media/cast/logging/stats_event_subscriber.h
diff --git a/media/cast/logging/stats_event_subscriber.h b/media/cast/logging/stats_event_subscriber.h
index 4e198dadce49c70b91766c1aec8213421c08e900..173378ab0b28c071df60db8ed121b8bf7ee6e37f 100644
--- a/media/cast/logging/stats_event_subscriber.h
+++ b/media/cast/logging/stats_event_subscriber.h
@@ -83,7 +83,7 @@ class StatsEventSubscriber : public RawEventSubscriber {
     DECODE_FPS,
     // Average encode duration in milliseconds.
     // TODO(imcheng): This stat is not populated yet because we do not have
-    // the time when encode started. Record it in kVideoFrameEncoded event.
+    // the time when encode started. Record it in FRAME_ENCODED event.
     AVG_ENCODE_TIME_MS,
     // Average playout delay in milliseconds, with target delay already
     // accounted for. Ideally, every frame should have a playout delay of 0.