Prevent playback looping after pause.

content/renderer/media/android/webmediaplayer_android.cc

Index: content/renderer/media/android/webmediaplayer_android.cc
diff --git a/content/renderer/media/android/webmediaplayer_android.cc b/content/renderer/media/android/webmediaplayer_android.cc
index 8c3f798fc4d7b2bc0275021f25b5a3a148436703..64fd1d0604f204b3acaa54d6846246ea71e1298f 100644
--- a/content/renderer/media/android/webmediaplayer_android.cc
+++ b/content/renderer/media/android/webmediaplayer_android.cc
@@ -866,7 +866,7 @@ void WebMediaPlayerAndroid::OnPlaybackComplete() {
   // If the loop attribute is set, timeChanged() will update the current time
   // to 0. It will perform a seek to 0. Issue a command to the player to start
   // playing after seek completes.
-  if (seeking_ && seek_time_.is_zero())
+  if (is_playing_ && seeking_ && seek_time_.is_zero())
     player_manager_->Start(player_id_);
   else
     playback_completed_ = true;