Run RemoveArcData after a user has opted out

components/arc/user_data/arc_user_data_service.h

Index: components/arc/user_data/arc_user_data_service.h
diff --git a/components/arc/user_data/arc_user_data_service.h b/components/arc/user_data/arc_user_data_service.h
new file mode 100644
index 0000000000000000000000000000000000000000..29405f9b9f64f3cac61c817645f0359d49157d6e
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+++ b/components/arc/user_data/arc_user_data_service.h
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+// 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 COMPONENTS_ARC_USER_DATA_ARC_USER_DATA_SERVICE
+#define COMPONENTS_ARC_USER_DATA_ARC_USER_DATA_SERVICE
+
+#include "base/macros.h"
+#include "base/threading/thread_checker.h"
+#include "components/arc/arc_bridge_service.h"
+#include "components/arc/arc_service.h"
+#include "components/prefs/pref_member.h"
+#include "components/signin/core/account_id/account_id.h"
+
+namespace arc {
+
+class ArcBridgeService;
+
+// This class controls the lifecycle of ARC user data, removing it when
+// necessary.
+class ArcUserDataService : public ArcService,
+                           public ArcBridgeService::Observer {
+ public:
+  explicit ArcUserDataService(
+      ArcBridgeService* arc_bridge_service,
+      std::unique_ptr<BooleanPrefMember> arc_enabled_pref,
+      const AccountId& account_id);
+  ~ArcUserDataService() override;
+
+  // ArcBridgeService::Observer:
+  // Called whenever the arc bridge is stopped to potentially remove data if
+  // the user has not opted in.
+  void OnBridgeStopped() override;
+
+ private:
+  base::ThreadChecker thread_checker_;
+
+  // Checks if ARC is both stopped and disabled (not opt-in) and triggers
+  // removal of user data if both conditions are true.
+  void ClearIfDisabled();
+
+  const std::unique_ptr<BooleanPrefMember> arc_enabled_pref_;
+
+  // Account ID for the account for which we currently have opt-in information.
+  AccountId primary_user_account_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcUserDataService);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_ARC_USER_DATA_ARC_USER_DATA_SERVICE