Service Worker: FetchEvent.preventDefault() results in a network error

Source/modules/serviceworkers/RespondWithObserver.cpp

Index: Source/modules/serviceworkers/RespondWithObserver.cpp
diff --git a/Source/modules/serviceworkers/RespondWithObserver.cpp b/Source/modules/serviceworkers/RespondWithObserver.cpp
index 6dce903cb015af6e242e00e6ccf9e7272b569c95..dd079a1413dfca48d8747d8eda5c4b24fab0cb20 100644
--- a/Source/modules/serviceworkers/RespondWithObserver.cpp
+++ b/Source/modules/serviceworkers/RespondWithObserver.cpp
@@ -74,11 +74,17 @@ void RespondWithObserver::contextDestroyed()
     m_state = Done;
 }
 
-void RespondWithObserver::didDispatchEvent()
+void RespondWithObserver::didDispatchEvent(bool defaultPrevented)
 {
     ASSERT(executionContext());
     if (m_state != Initial)
         return;
+
+    if (defaultPrevented) {
+        responseWasRejected();
+        return;
+    }
+
     ServiceWorkerGlobalScopeClient::from(executionContext())->didHandleFetchEvent(m_eventID);
     m_state = Done;
 }