Fix underflow duration calculation for MSE.

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index 7929ecd88b86d75b235875e3548a3359ef119a92..d604641bad5ae1f2a6fcedae673dd6004ab5141a 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -1336,13 +1336,11 @@ void WebMediaPlayerImpl::OnBufferingStateChange(BufferingState state) {
     // Buffering has underflowed.
     DCHECK_EQ(state, BUFFERING_HAVE_NOTHING);
 
-    // Report the number of times we've entered the underflow state. Only report
-    // for src= playback since for MSE it's out of our control. Ensure we only
-    // report the value when transitioning from HAVE_ENOUGH to HAVE_NOTHING.
-    if (data_source_ &&
-        ready_state_ == WebMediaPlayer::ReadyStateHaveEnoughData) {
+    // Report the number of times we've entered the underflow state. Ensure we
+    // only report the value when transitioning from HAVE_ENOUGH to
+    // HAVE_NOTHING.
+    if (ready_state_ == WebMediaPlayer::ReadyStateHaveEnoughData)
       underflow_timer_.reset(new base::ElapsedTimer());
-    }
 
     // It shouldn't be possible to underflow if we've not advanced past
     // HAVE_CURRENT_DATA.