Remove OnOptInChanged callback.

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

Index: chrome/browser/ui/ash/launcher/launcher_extension_app_updater.h
diff --git a/chrome/browser/ui/ash/launcher/launcher_extension_app_updater.h b/chrome/browser/ui/ash/launcher/launcher_extension_app_updater.h
index 1de637ff264a0878ca2483bae7589379d412697b..5232d1ca3957bddba0e3fab7a32ebe0f59137ae2 100644
--- a/chrome/browser/ui/ash/launcher/launcher_extension_app_updater.h
+++ b/chrome/browser/ui/ash/launcher/launcher_extension_app_updater.h
@@ -18,7 +18,6 @@ class ExtensionSet;
 class LauncherExtensionAppUpdater
     : public LauncherAppUpdater,
       public extensions::ExtensionRegistryObserver,
-      public arc::ArcAuthService::Observer,
       public ArcAppListPrefs::Observer {
  public:
   LauncherExtensionAppUpdater(Delegate* delegate,
@@ -37,9 +36,6 @@ class LauncherExtensionAppUpdater
                               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;