[PUSH] Fix lifetime of the hasPermission callback in layout Tests.

Source/modules/push_messaging/PushManager.cpp

Index: Source/modules/push_messaging/PushManager.cpp
diff --git a/Source/modules/push_messaging/PushManager.cpp b/Source/modules/push_messaging/PushManager.cpp
index c375a159930af831a98f4157b6f950351b9e5d6a..c0e602eb91f738b9069da15a723702a063d5b98d 100644
--- a/Source/modules/push_messaging/PushManager.cpp
+++ b/Source/modules/push_messaging/PushManager.cpp
@@ -83,8 +83,9 @@ ScriptPromise PushManager::hasPermission(ScriptState* scriptState)
 
     RefPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
 
+    ScriptPromise promise = resolver->promise();
     client->getPermissionStatus(new PushPermissionStatusCallback(resolver), serviceWorkerProvider);
-    return resolver->promise();
+    return promise;
 }
 
 void PushManager::doRegister(WebPushClient* client, PassRefPtr<ScriptPromiseResolver> resolver, WebServiceWorkerProvider* serviceWorkerProvider)