Refactor NotificationPlatformBridgeLinux

chrome/browser/notifications/stub_notification_platform_bridge.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/notifications/stub_notification_platform_bridge.h"
 
 #include "base/memory/ptr_util.h"
 #include "content/public/browser/browser_thread.h"
 
 StubNotificationPlatformBridge::StubNotificationPlatformBridge()
@@ skipping 54 matching lines @@
         notifications_.at(profile_id);
     for (auto notification : profile_notifications)
       displayed_notifications->insert(notification.id());
   }
 
   content::BrowserThread::PostTask(
       content::BrowserThread::UI, FROM_HERE,
       base::BindOnce(callback, base::Passed(&displayed_notifications),
                      true /* supports_synchronization */));
 }
+
+void StubNotificationPlatformBridge::SetReadyCallback(
+    NotificationBridgeReadyCallback callback) {
+  std::move(callback).Run(true);
+}