Bug 1252168 - Don't send CDM unsupported notifications from Gecko to chrome. r=kentuckyfriedtakahe

MozReview-Commit-ID: FDfpeEt3HfT

--HG--
extra : rebase_source : 5bddbeae15a8afb750f4baae416d9ff8257893c4

dom/media/eme/MediaKeySystemAccess.cpp

@@ -577,6 +577,12 @@ MediaKeySystemAccess::NotifyObservers(nsPIDOMWindowInner* aWindow,
                                       const nsAString& aKeySystem,
                                       MediaKeySystemStatus aStatus)
 {
+  if (aStatus == MediaKeySystemStatus::Cdm_not_supported) {
+    // Ignore, since there's nothing the user can do to rectify this, and we
+    // don't want the prompt to confuse them.
+    // TODO: Remove places that call with this entirely.
+    return;
+  }
   RequestMediaKeySystemAccessNotification data;
   data.mKeySystem = aKeySystem;
   data.mStatus = aStatus;

dom/media/test/test_eme_request_notifications.html

@@ -74,11 +74,6 @@ var tests = [
     expectedStatus: 'cdm-disabled',
     prefs: [["media.eme.enabled", true], ["media.eme.clearkey.enabled", false]]
   },
-  {
-    keySystem: 'unsupported-keysystem',
-    shouldPass: false,
-    expectedStatus: 'cdm-not-supported'
-  },
   {
     keySystem: CLEARKEY_ID + '.10000' , // A stupendously high min CDM version, presumably not installed.
     shouldPass: false,