chromeos: Introduce ash::SystemTrayTestApi

ash/system/session/tray_session_length_limit_unittest.cc

 // Copyright 2014 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 "ash/system/session/tray_session_length_limit.h"
 
 #include "ash/session/session_controller.h"
 #include "ash/shell.h"
 #include "ash/system/tray/label_tray_view.h"
 #include "ash/system/tray/system_tray.h"
+#include "ash/system/tray/system_tray_test_api.h"
 #include "ash/test/ash_test_base.h"
 #include "base/memory/ptr_util.h"
 #include "base/time/time.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/notification.h"
 #include "ui/message_center/notification_types.h"
 
 namespace ash {
 namespace test {
 
 class TraySessionLengthLimitTest : public AshTestBase {
  public:
   TraySessionLengthLimitTest() = default;
   ~TraySessionLengthLimitTest() override = default;
 
  protected:
   LabelTrayView* GetSessionLengthLimitTrayView() {
-    return GetPrimarySystemTray()
-        ->GetTraySessionLengthLimitForTesting()
+    return SystemTrayTestApi(GetPrimarySystemTray())
+        .tray_session_length_limit()
         ->tray_bubble_view_;
   }
 
   void UpdateSessionLengthLimitInMin(int mins) {
     Shell::Get()->session_controller()->SetSessionLengthLimit(
         base::TimeDelta::FromMinutes(mins), base::TimeTicks::Now());
   }
 
   message_center::Notification* GetNotification() {
     const message_center::NotificationList::Notifications& notifications =
@@ skipping 118 matching lines @@
   // re-appear and be re-read.
   UpdateSessionLengthLimitInMin(15);
   notification = GetNotification();
   EXPECT_TRUE(notification);
   EXPECT_TRUE(notification->rich_notification_data()
                   .should_make_spoken_feedback_for_popup_updates);
 }
 
 }  // namespace test
 }  // namespace ash