Bug 1301189 - Use ExposeObjectToActiveJS in nsModuleScript. r=smaug

These GC things can be passed to the JS engine, so we should make sure
they are not marked gray.

MozReview-Commit-ID: GJDogXSuqYh

--HG--
extra : rebase_source : a9231a81c2791f1da6918595e2d6329f7ba14e79

dom/base/nsScriptLoader.cpp

@@ -314,8 +314,18 @@ public:
                  JS::Handle<JSObject*> aModuleRecord);
 
   nsScriptLoader* Loader() const { return mLoader; }
-  JSObject* ModuleRecord() const { return mModuleRecord; }
-  JS::Value Exception() const { return mException; }
+  JSObject* ModuleRecord() const
+  {
+    if (mModuleRecord) {
+      JS::ExposeObjectToActiveJS(mModuleRecord);
+    }
+    return mModuleRecord;
+  }
+  JS::Value Exception() const
+  {
+    JS::ExposeValueToActiveJS(mException);
+    return mException;
+  }
   nsIURI* BaseURL() const { return mBaseURL; }
 
   void SetInstantiationResult(JS::Handle<JS::Value> aMaybeException);