Fix the asset for bug 1112920 to not touch uninitialized memory. Totally my fault, since I moved it above the mCx assignment, and now we have a CLOSED TREE.

dom/base/ScriptSettings.cpp

@@ -334,7 +334,7 @@ AutoJSAPI::InitInternal(JSObject* aGlobal, JSContext* aCx, bool aIsMainThread)
 {
   MOZ_ASSERT(aCx);
   MOZ_ASSERT(aIsMainThread == NS_IsMainThread());
-  MOZ_ASSERT(!JS_IsExceptionPending(mCx));
+  MOZ_ASSERT(!JS_IsExceptionPending(aCx));
 
   mCx = aCx;
   mIsMainThread = aIsMainThread;