Bug 1270738 - don't need to check the playing state for 'test_audioNotificationSilent_audioFile.html'. r=baku

The reason to check the playing state is because we want to make sure the non-audible event is not due to
media element ended. However, in bug 1240423, we introduced the different inactive state (inactive-pause and
inactive-nonaudible), so we don't need to check the playing state anymore, we can just check whether the event
is 'inactive-nonaudible', but not 'inactive-pause'.

MozReview-Commit-ID: 6slOhb68Qp5

--HG--
extra : rebase_source : 08529c37e32a7dacc6b14407d536240fcca510c4

dom/base/test/test_audioNotificationSilent_audioFile.html

@@ -12,7 +12,6 @@ SimpleTest.waitForExplicitFinish();
 
 var generator = runTest();
 var expectedPlaybackActive = null;
-var expectedPlaying = null;
 
 var audio = new Audio();
 audio.src = "audioEndedDuringPlaying.webm";
@@ -24,7 +23,6 @@ var observer = {
   observe: function(subject, topic, data) {
     is(topic, "audio-playback", "audio-playback received");
     is(data, expectedPlaybackActive, "Corrrect audible state");
-    is(!audio.ended, expectedPlaying, "Corrrect playing state");
     continueTest();
   }
 };
@@ -42,7 +40,6 @@ function audioPlayingStart() {
   ok(true, "Observer set");
 
   expectedPlaybackActive = 'active';
-  expectedPlaying = true;
 
   info("Audio playing start");
   audio.play();
@@ -52,7 +49,6 @@ function audioBecomeSilentDuringPlaying() {
   info("Audio would become silent during playing");
 
   expectedPlaybackActive = 'inactive-nonaudible';
-  expectedPlaying = true;
 }
 
 function finish() {