NotificationController::clientFrom() should return a reference

Source/modules/notifications/Notification.cpp

Index: Source/modules/notifications/Notification.cpp
diff --git a/Source/modules/notifications/Notification.cpp b/Source/modules/notifications/Notification.cpp
index 5114d8a625d39fef2f6226b9b7ae49de7b2052e3..0c4e5519c69252575a33d20e531e4d30d5b07c92 100644
--- a/Source/modules/notifications/Notification.cpp
+++ b/Source/modules/notifications/Notification.cpp
@@ -43,8 +43,8 @@ namespace WebCore {
 
 Notification* Notification::create(ExecutionContext* context, const String& title, const Dictionary& options)
 {
-    NotificationClient* client = NotificationController::clientFrom(toDocument(context)->frame());
-    Notification* notification = adoptRefCountedGarbageCollected(new Notification(title, context, client));
+    NotificationClient& client = NotificationController::clientFrom(toDocument(context)->frame());
+    Notification* notification = adoptRefCountedGarbageCollected(new Notification(title, context, &client));
 
     String argument;
     if (options.get("body", argument))
@@ -89,7 +89,7 @@ void Notification::show()
     if (!toDocument(executionContext())->page())
         return;
 
-    if (NotificationController::from(toDocument(executionContext())->frame())->client()->checkPermission(executionContext()) != NotificationClient::PermissionAllowed) {
+    if (m_client->checkPermission(executionContext()) != NotificationClient::PermissionAllowed) {
         dispatchErrorEvent();
         return;
     }
@@ -164,13 +164,13 @@ const String& Notification::permission(ExecutionContext* context)
     ASSERT(toDocument(context)->page());
 
     UseCounter::count(context, UseCounter::NotificationPermission);
-    return permissionString(NotificationController::from(toDocument(context)->frame())->client()->checkPermission(context));
+    return permissionString(NotificationController::clientFrom(toDocument(context)->frame()).checkPermission(context));
 }
 
 void Notification::requestPermission(ExecutionContext* context, PassOwnPtr<NotificationPermissionCallback> callback)
 {
     ASSERT(toDocument(context)->page());
-    NotificationController::from(toDocument(context)->frame())->client()->requestPermission(context, callback);
+    NotificationController::clientFrom(toDocument(context)->frame()).requestPermission(context, callback);
 }
 
 bool Notification::dispatchEvent(PassRefPtrWillBeRawPtr<Event> event)