Use mojo Shelf interfaces for both mash and classic ash.

chrome/browser/ui/ash/launcher/launcher_controller_helper.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_LAUNCHER_LAUNCHER_CONTROLLER_HELPER_H_
 #define CHROME_BROWSER_UI_ASH_LAUNCHER_LAUNCHER_CONTROLLER_HELPER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 23 matching lines @@
 
   // Returns the app id of the specified tab, or an empty string if there is
   // no app. All known profiles will be queried for this.
   virtual std::string GetAppID(content::WebContents* tab);
 
   // Returns true if |id| is valid for the currently active profile.
   // Used during restore to ignore no longer valid extensions.
   // Note that already running applications are ignored by the restore process.
   virtual bool IsValidIDForCurrentUser(const std::string& id) const;
 
-  // Sets the currently active profile for the usage of |GetAppID|.
-  virtual void SetCurrentUser(Profile* profile);
-
   void LaunchApp(const std::string& app_id,
                  ash::LaunchSource source,
                  int event_flags);
 
   virtual ArcAppListPrefs* GetArcAppListPrefs() const;
 
   Profile* profile() { return profile_; }
   const Profile* profile() const { return profile_; }
+  void set_profile(Profile* profile) { profile_ = profile; }
 
  private:
   // ExtensionEnableFlowDelegate:
   void ExtensionEnableFlowFinished() override;
   void ExtensionEnableFlowAborted(bool user_initiated) override;
 
+  // The currently active profile for the usage of |GetAppID|.
   Profile* profile_;
   std::unique_ptr<ExtensionEnableFlow> extension_enable_flow_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherControllerHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_LAUNCHER_CONTROLLER_HELPER_H_