[ServiceWorker] Fix ExtendableMessageEvent idl binding

third_party/WebKit/Source/modules/serviceworkers/ExtendableMessageEvent.cpp

Index: third_party/WebKit/Source/modules/serviceworkers/ExtendableMessageEvent.cpp
diff --git a/third_party/WebKit/Source/modules/serviceworkers/ExtendableMessageEvent.cpp b/third_party/WebKit/Source/modules/serviceworkers/ExtendableMessageEvent.cpp
index c37b239c6a0ff04ac4741b015bad1625000e90a8..1ec3cc1ac6c5d21594b912cd1bf19263b6d52e76 100644
--- a/third_party/WebKit/Source/modules/serviceworkers/ExtendableMessageEvent.cpp
+++ b/third_party/WebKit/Source/modules/serviceworkers/ExtendableMessageEvent.cpp
@@ -51,24 +51,17 @@ ExtendableMessageEvent* ExtendableMessageEvent::Create(
   return event;
 }
 
-MessagePortArray ExtendableMessageEvent::ports(bool& is_null) const {
+MessagePortArray ExtendableMessageEvent::ports() const {
   // TODO(bashi): Currently we return a copied array because the binding
   // layer could modify the content of the array while executing JS callbacks.
   // Avoid copying once we can make sure that the binding layer won't
   // modify the content.
   if (ports_) {
-    is_null = false;
     return *ports_;
   }
-  is_null = true;
   return MessagePortArray();
 }
 
-MessagePortArray ExtendableMessageEvent::ports() const {
-  bool unused;
-  return ports(unused);
-}
-
 void ExtendableMessageEvent::source(
     ClientOrServiceWorkerOrMessagePort& result) const {
   if (source_as_client_)