Bug 1256046 - Hide MozPowerManager from the Web; r=khuey,bzbarsky

navigator.mozPower is already hidden behind the power permission,
so there is no need to be exposing this interface unconditionally.

dom/tests/mochitest/general/test_interfaces.html

@@ -826,7 +826,7 @@ var interfaceNamesInGlobalScope =
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "MozOtaStatusEvent", b2g: true},
 // IMPORTANT: Do not change this list without review from a DOM peer!
-    "MozPowerManager",
+    {name: "MozPowerManager", b2g: true, permission: "power"},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "mozRTCIceCandidate",
 // IMPORTANT: Do not change this list without review from a DOM peer!

dom/webidl/MozPowerManager.webidl

@@ -21,6 +21,7 @@ enum FactoryResetReason {
 /**
  * This interface implements navigator.mozPower
  */
+[CheckAnyPermissions="power"]
 interface MozPowerManager
 {
     [Throws]