Bug 1331763 - part1: Support EME content for AudioContext::CreateMediaElementSource; r=cpearce

MozReview-Commit-ID: 1OMySAPCH4i

dom/html/HTMLMediaElement.cpp

@@ -3361,7 +3361,7 @@ HTMLMediaElement::CaptureStreamInternal(bool aFinishWhenEnded,
   if (!window) {
     return nullptr;
   }
-  if (ContainsRestrictedContent()) {
+  if (!aCaptureAudio && ContainsRestrictedContent()) {
     return nullptr;
   }