Use mojo Shelf interfaces for both mash and classic ash.

chrome/browser/ui/ash/launcher/launcher_controller_helper.h

Index: chrome/browser/ui/ash/launcher/launcher_controller_helper.h
diff --git a/chrome/browser/ui/ash/launcher/launcher_controller_helper.h b/chrome/browser/ui/ash/launcher/launcher_controller_helper.h
index 77e9f8a34c0f05846eb2b2029f640abbe871f8b7..78dba52f8ff9b75dd3ac450ada707c6c276910c4 100644
--- a/chrome/browser/ui/ash/launcher/launcher_controller_helper.h
+++ b/chrome/browser/ui/ash/launcher/launcher_controller_helper.h
@@ -41,9 +41,6 @@ class LauncherControllerHelper : public ExtensionEnableFlowDelegate {
   // 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);
@@ -52,12 +49,14 @@ class LauncherControllerHelper : public ExtensionEnableFlowDelegate {
 
   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_;