Run RemoveArcData after a user has opted out

components/arc/userdata/arc_user_data_service.h

Index: components/arc/userdata/arc_user_data_service.h
diff --git a/components/arc/userdata/arc_user_data_service.h b/components/arc/userdata/arc_user_data_service.h
new file mode 100644
index 0000000000000000000000000000000000000000..52dc58cb618345d22d57e1d974f6f447d78a2637
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+++ b/components/arc/userdata/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_USERDATA_ARC_USER_DATA_SERVICE
+#define COMPONENTS_ARC_USERDATA_ARC_USER_DATA_SERVICE
+
+#include "base/macros.h"
+#include "base/threading/thread_checker.h"
+#include "components/arc/arc_bridge_service.h"
+#include "components/signin/core/account_id/account_id.h"
+
+class PrefService;
+
+namespace arc {
+
+class ArcBridgeService;
+
+// This class controls the lifecycle of ARC user data, removing it when
+// necessary.
+class ArcUserDataService : public ArcBridgeService::Observer {
+ public:
+  ArcUserDataService();
+  ~ArcUserDataService() override;
+
+  static ArcUserDataService* Get();
+
+  // Checks if arc is both stopped and disabled (opt-out) and triggers removal
+  // of user data if both conditions are true.
+  void ClearIfDisabled(PrefService* user_prefs, const AccountId& account_id);
+
+  // Called whenever arc service state changes to potentially remove data if
+  // the user has opted out.
+  // ArcBridgeService::Observer:
+  void OnStateChanged(ArcBridgeService::State state) override;
+
+ private:
+  base::ThreadChecker thread_checker_;
+
+  PrefService* user_prefs_;
+  AccountId user_prefs_account_id_ = EmptyAccountId();
+
+  DISALLOW_COPY_AND_ASSIGN(ArcUserDataService);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_ARC_USERDATA_ARC_USER_DATA_SERVICE