Service Worker: (Re-commit) Make ServiceWorkerRegistration.update() return a promise. (Blink 1/3)

Source/modules/serviceworkers/ServiceWorkerRegistration.h

Index: Source/modules/serviceworkers/ServiceWorkerRegistration.h
diff --git a/Source/modules/serviceworkers/ServiceWorkerRegistration.h b/Source/modules/serviceworkers/ServiceWorkerRegistration.h
index 3e4acdce99e475e55ba56c2686907a394e6ed2e1..3f032d68e1597a1101be0ba5408e2f92b7453c7a 100644
--- a/Source/modules/serviceworkers/ServiceWorkerRegistration.h
+++ b/Source/modules/serviceworkers/ServiceWorkerRegistration.h
@@ -55,7 +55,7 @@ public:
 
     WebServiceWorkerRegistration* webRegistration() { return m_outerRegistration.get(); }
 
-    void update(ScriptState*, ExceptionState&);
+    ScriptPromise update(ScriptState*);
     ScriptPromise unregister(ScriptState*);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(updatefound);