Bug 931249 - Patch 14 - kungfuDeathGrip. r=baku

--HG--
extra : rebase_source : 9ef21438c85cb30aa7b2579e4ac6efdb6980b49d

dom/workers/ScriptLoader.cpp

@@ -1186,6 +1186,10 @@ CacheCreator::FailLoaders(nsresult aRv)
 {
   AssertIsOnMainThread();
 
+  // Fail() can call LoadingFinished() which may call ExecuteFinishedScripts()
+  // which sets mCacheCreator to null, so hold a ref.
+  nsRefPtr<CacheCreator> kungfuDeathGrip = this;
+
   for (uint32_t i = 0, len = mLoaders.Length(); i < len; ++i) {
     mLoaders[i]->Fail(aRv);
   }