Use mojo SystemTray interfaces for both mash and classic ash

chrome/browser/ui/ash/chrome_shell_delegate.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_ASH_CHROME_SHELL_DELEGATE_H_
 #define CHROME_BROWSER_UI_ASH_CHROME_SHELL_DELEGATE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 14 matching lines @@
 
 class ChromeLauncherControllerImpl;
 
 class ChromeShellDelegate : public ash::ShellDelegate,
                             public content::NotificationObserver {
  public:
   ChromeShellDelegate();
   ~ChromeShellDelegate() override;
 
   // ash::ShellDelegate overrides;
+  shell::Connector* GetShellConnector() const override;
   bool IsFirstRunAfterBoot() const override;
   bool IsMultiProfilesEnabled() const override;
   bool IsIncognitoAllowed() const override;
   bool IsRunningInForcedAppMode() const override;
   bool CanShowWindowForUser(ash::WmWindow* window) const override;
   bool IsForceMaximizeOnFirstRun() const override;
   void PreInit() override;
   void PreShutdown() override;
   void Exit() override;
   keyboard::KeyboardUI* CreateKeyboardUI() override;
@@ skipping 31 matching lines @@
   // Proxies events from chrome/browser to ash::UserMetricsRecorder.
   std::unique_ptr<ChromeUserMetricsRecorder> chrome_user_metrics_recorder_;
 
   std::unique_ptr<chromeos::DisplayConfigurationObserver>
       display_configuration_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeShellDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_CHROME_SHELL_DELEGATE_H_