bug 1276013, fix regression in e10s window name handling, r=mconley

--HG--
extra : rebase_source : 0ed994af42ae9f070fb31ec4a1e82914dbf7e48e

dom/ipc/ContentParent.cpp

@@ -5539,10 +5539,13 @@ ContentParent::RecvCreateWindow(PBrowserParent* aThisTab,
   nsCOMPtr<mozIDOMWindowProxy> window;
   TabParent::AutoUseNewTab aunt(newTab, aWindowIsNew, aURLToLoad);
 
-  const char* name = aName.IsVoid() ? nullptr : NS_ConvertUTF16toUTF8(aName).get();
   const char* features = aFeatures.IsVoid() ? nullptr : aFeatures.get();
 
-  *aResult = pwwatch->OpenWindow2(parent, nullptr, name, features, aCalledFromJS,
+  *aResult = pwwatch->OpenWindow2(parent, nullptr,
+                                  aName.IsVoid() ?
+                                    nullptr :
+                                    NS_ConvertUTF16toUTF8(aName).get(),
+                                  features, aCalledFromJS,
                                   false, false, thisTabParent, nullptr,
                                   aFullZoom, 1, getter_AddRefs(window));