Migrate upgrade notifications to observer

chrome/browser/ui/ash/system_tray_client_browsertest.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/ui/ash/system_tray_client.h"
 
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/system/enterprise/tray_enterprise.h"
 #include "ash/system/tray/label_tray_view.h"
@@ skipping 16 matching lines @@
 using SystemTrayClientTest = InProcessBrowserTest;
 
 // Test that a chrome update shows the update icon in the system menu.
 IN_PROC_BROWSER_TEST_F(SystemTrayClientTest, UpdateTrayIcon) {
   ash::TrayUpdate* tray_update = GetSystemTray()->tray_update();
 
   // When no update is pending, the icon isn't visible.
   EXPECT_FALSE(tray_update->tray_view()->visible());
 
   // Simulate an upgrade. This sends a mojo message to ash.
-  UpgradeDetector::GetInstance()->NotifyUpgradeRecommended();
+  UpgradeDetector::GetInstance()->NotifyUpgrade();
   content::RunAllPendingInMessageLoop();
 
   // Tray icon is now visible.
   EXPECT_TRUE(tray_update->tray_view()->visible());
 }
 
 // Test that a flash update causes the update UI to show in the system menu.
 IN_PROC_BROWSER_TEST_F(SystemTrayClientTest, FlashUpdateTrayIcon) {
   ash::TrayUpdate* tray_update = GetSystemTray()->tray_update();
 
@@ skipping 20 matching lines @@
   system_tray->ShowDefaultView(ash::BUBBLE_CREATE_NEW);
 
   // Managed devices show an item in the menu.
   ash::TrayEnterprise* tray_enterprise =
       system_tray->GetTrayEnterpriseForTesting();
   ASSERT_TRUE(tray_enterprise->tray_view());
   EXPECT_TRUE(tray_enterprise->tray_view()->visible());
 
   system_tray->CloseSystemBubble();
 }