Remove OnOptInChanged callback.

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

 // 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.
 
 #ifndef CHROME_BROWSER_UI_ASH_LAUNCHER_LAUNCHER_EXTENSION_APP_UPDATER_H_
 #define CHROME_BROWSER_UI_ASH_LAUNCHER_LAUNCHER_EXTENSION_APP_UPDATER_H_
 
 #include "base/macros.h"
-#include "chrome/browser/chromeos/arc/arc_auth_service.h"
 #include "chrome/browser/ui/app_list/arc/arc_app_list_prefs.h"
 #include "chrome/browser/ui/ash/launcher/launcher_app_updater.h"
 #include "extensions/browser/extension_registry_observer.h"
 
 namespace extensions {
 class ExtensionSet;
 }  // namespace extensions
 
 class LauncherExtensionAppUpdater
     : public LauncherAppUpdater,
       public extensions::ExtensionRegistryObserver,
-      public arc::ArcAuthService::Observer,
       public ArcAppListPrefs::Observer {
  public:
   LauncherExtensionAppUpdater(Delegate* delegate,
                               content::BrowserContext* browser_context);
   ~LauncherExtensionAppUpdater() override;
 
   // ExtensionRegistryObserver:
   void OnExtensionLoaded(content::BrowserContext* browser_context,
                          const extensions::Extension* extension) override;
   void OnExtensionUnloaded(
       content::BrowserContext* browser_context,
       const extensions::Extension* extension,
       extensions::UnloadedExtensionInfo::Reason reason) override;
   void OnExtensionUninstalled(content::BrowserContext* browser_context,
                               const extensions::Extension* extension,
                               extensions::UninstallReason reason) override;
   void OnShutdown(extensions::ExtensionRegistry* registry) override;
 
-  // arc::ArcAuthService::Observer:
-  void OnOptInChanged(arc::ArcAuthService::State state) override;
-
   // ArcAppListPrefs::Observer
   void OnPackageInstalled(
       const arc::mojom::ArcPackageInfo& package_info) override;
   void OnPackageRemoved(const std::string& package_name) override;
 
  private:
   void StartObservingExtensionRegistry();
   void StopObservingExtensionRegistry();
 
   void UpdateHostedApps();
   void UpdateHostedApps(const extensions::ExtensionSet& extensions);
   void UpdateHostedApp(const std::string& app_id);
   void UpdateEquivalentHostedApp(const std::string& arc_package_name);
 
   extensions::ExtensionRegistry* extension_registry_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherExtensionAppUpdater);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_LAUNCHER_EXTENSION_APP_UPDATER_H_