Bug 1456271 - Ajust tests to reflect the alignment to the spec. r=padenot

Both for mochitest (simply an expectation adjustment), and in mochitest (align
with the code).

MozReview-Commit-ID: 2UIq4zrcd02

--HG--
extra : rebase_source : 1858e73b3ad89aade3219ee8556c653c55c85bed

dom/media/webaudio/test/test_periodicWave.html

@@ -41,10 +41,9 @@ addLoadEvent(function() {
     ac.createPeriodicWave(new Float32Array(4097), new Float32Array(4097));
   });
 
-  // real || imag
-  expectException(function() {
+  expectNoException(function() {
     new PeriodicWave(ac, {});
-  }, DOMException.INDEX_SIZE_ERR);
+  });
 
   // real.size == imag.size
   expectException(function() {

testing/web-platform/meta/webaudio/idlharness.https.html.ini

@@ -164,12 +164,6 @@
   [MediaStreamTrackAudioSourceNode interface: existence and properties of interface prototype object's @@unscopables property]
     expected: FAIL
 
-  [PeriodicWave must be primary interface of new PeriodicWave(context)]
-    expected: FAIL
-
-  [Stringification of new PeriodicWave(context)]
-    expected: FAIL
-
   [AudioWorklet interface: existence and properties of interface object]
     expected: FAIL