Bug 1240909 - Use pushPermissions to be e10s compatible. r=mccr8

--HG--
extra : transplant_source : %23%84%0C%18C%DA%5DM%88%1D%0F%96%A2%FD%F4%25%5EaV%B6

dom/tests/mochitest/general/mochitest.ini

@@ -74,7 +74,7 @@ skip-if = e10s || buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'androi
 [test_pointerPreserves3D.html]
 [test_framedhistoryframes.html]
 [test_idleapi_permissions.html]
-skip-if = e10s || buildapp == 'b2g' || buildapp == 'mulet'
+skip-if = buildapp == 'b2g' || buildapp == 'mulet'
 [test_img_mutations.html]
 [test_interfaces.html]
 skip-if = ((buildapp == 'mulet' || buildapp == 'b2g') && toolkit != 'gonk') #Bug 931116, b2g desktop specific, initial triage

dom/tests/mochitest/general/test_idleapi_permissions.html

@@ -35,13 +35,12 @@ function run_test() {
 
   var added = doAddIdleObserver(this.idleObserver, false);
   ok(!added, "Should not be able to add idle observer without permission");
-  
-  SpecialPowers.addPermission("idle", true, document);
 
-  added = doAddIdleObserver(this.idleObserver, true);
-  ok(added, "Should be able to add idle observer with permission.");
-  
-  SimpleTest.finish();
+  SpecialPowers.pushPermissions([{type: "idle", allow: true, context: document}], () => {
+    added = doAddIdleObserver(this.idleObserver, true);
+    ok(added, "Should be able to add idle observer with permission.");
+    SimpleTest.finish();
+  });
 }
 
 SimpleTest.waitForExplicitFinish();