Bug 1456271 - Ajust WPT expectations: the idl test for PeriodicWave now passes. r=padenot

MozReview-Commit-ID: 2UIq4zrcd02

--HG--
extra : rebase_source : a46760c048314f989509fc24e7240d68fa9976e6

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