Remove OnOptInChanged callback.

chrome/browser/chromeos/arc/arc_auth_service.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/chromeos/arc/arc_auth_service.h"
 
 #include <utility>
 
 #include "ash/common/shelf/shelf_delegate.h"
 #include "ash/common/wm_shell.h"
@@ skipping 421 matching lines @@
 }
 
 void ArcAuthService::GetIsAccountManaged(
     const GetIsAccountManagedCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   callback.Run(policy_util::IsAccountManaged(profile_));
 }
 
 void ArcAuthService::SetState(State state) {
-  if (state_ == state)
-    return;
-
   state_ = state;
-  for (auto& observer : observer_list_)
-    observer.OnOptInChanged(state_);
 }
 
 bool ArcAuthService::IsAllowed() const {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   return profile_ != nullptr;
 }
 
 void ArcAuthService::OnPrimaryUserProfilePrepared(Profile* profile) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DCHECK(profile && profile != profile_);
@@ skipping 506 matching lines @@
       return os << "FETCHING_CODE";
     case ArcAuthService::State::ACTIVE:
       return os << "ACTIVE";
     default:
       NOTREACHED();
       return os;
   }
 }
 
 }  // namespace arc