Issue #618 - Fix error events fired when loading JS module dependencies fail

When module dependencies fail, don't spam with errors for each import; only fire
the error event once.

Ref: BZ 1421259

dom/script/ScriptElement.cpp

@@ -21,11 +21,11 @@ using namespace mozilla::dom;
 NS_IMETHODIMP
 ScriptElement::ScriptAvailable(nsresult aResult,
                                nsIScriptElement *aElement,
-                               bool aIsInline,
+                               bool aIsInlineClassicScript,
                                nsIURI *aURI,
                                int32_t aLineNo)
 {
-  if (!aIsInline && NS_FAILED(aResult)) {
+  if (!aIsInlineClassicScript && NS_FAILED(aResult)) {
     nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
     if (parser) {
       parser->PushDefinedInsertionPoint();