Bug 1164581 - Adding an overload for NS_ProxyRelease that accepts already_AddRefed, and removing all the others. r=bobbyholley

netwerk/cache2/CacheIndex.h

@@ -1046,16 +1046,7 @@ private:
       : mObserver(aWeakObserver) { }
     virtual ~DiskConsumptionObserver() {
       if (mObserver && !NS_IsMainThread()) {
-        nsIWeakReference *obs;
-        mObserver.forget(&obs);
-
-        nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
-        if (mainThread) {
-          NS_ProxyRelease(mainThread, obs);
-        } else {
-          NS_WARNING("Cannot get main thread, leaking weak reference to "
-                     "CacheStorageConsumptionObserver.");
-        }
+        NS_ReleaseOnMainThread(mObserver.forget());
       }
     }