Clear old ARC instance before opt-in.

chrome/browser/chromeos/arc/arc_auth_service_browsertest.cc

 // 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.
 
 #include <memory>
 #include <string>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 162 matching lines @@
         AccountId::FromUserEmailGaiaId(kFakeUserName, "1234567890"));
     GetFakeUserManager()->AddUser(account_id);
     GetFakeUserManager()->LoginUser(account_id);
 
     // Set up ARC for test profile.
     std::unique_ptr<BooleanPrefMember> arc_enabled_pref =
         base::MakeUnique<BooleanPrefMember>();
     arc_enabled_pref->Init(prefs::kArcEnabled, profile()->GetPrefs());
     ArcServiceManager::Get()->OnPrimaryUserProfilePrepared(
         multi_user_util::GetAccountIdFromProfile(profile()),
-        std::move(arc_enabled_pref));
+        std::move(arc_enabled_pref), profile()->GetPrefs());
     ArcAuthService::Get()->OnPrimaryUserProfilePrepared(profile());
   }
 
   void TearDownOnMainThread() override {
     ArcAuthService::Get()->Shutdown();
     ArcServiceManager::Get()->Shutdown();
     profile_.reset();
     user_manager_enabler_.reset();
   }
 
@@ skipping 53 matching lines @@
 
   prefs->SetBoolean(prefs::kArcEnabled, true);
   token_service()->IssueTokenForAllPendingRequests(kManagedAuthToken,
                                                    base::Time::Max());
   ArcAuthServiceShutdownObserver observer;
   observer.Wait();
   ASSERT_EQ(ArcAuthService::State::STOPPED, ArcAuthService::Get()->state());
 }
 
 }  // namespace arc