Fix use-after-free in HDDDTC shutdown

chrome/browser/sync/glue/history_delete_directives_data_type_controller.h

Index: chrome/browser/sync/glue/history_delete_directives_data_type_controller.h
diff --git a/chrome/browser/sync/glue/history_delete_directives_data_type_controller.h b/chrome/browser/sync/glue/history_delete_directives_data_type_controller.h
new file mode 100644
index 0000000000000000000000000000000000000000..7b7fbff4525da5c25ff4f6a54d5a00440dcf96eb
--- /dev/null
+++ b/chrome/browser/sync/glue/history_delete_directives_data_type_controller.h
@@ -0,0 +1,50 @@
+// Copyright 2014 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 CHROME_BROWSER_SYNC_GLUE_HISTORY_DELETE_DIRECTIVES_DATA_TYPE_CONTROLLER_H_
+#define CHROME_BROWSER_SYNC_GLUE_HISTORY_DELETE_DIRECTIVES_DATA_TYPE_CONTROLLER_H_
+
+#include "chrome/browser/sync/glue/local_device_info_provider.h"
+#include "chrome/browser/sync/profile_sync_service_observer.h"
+#include "components/sync_driver/ui_data_type_controller.h"
+
+class Profile;
+class ProfileSyncService;
+
+namespace browser_sync {
+
+// A controller for delete directives, which cannot sync when full encryption
+// is enabled.
+class HistoryDeleteDirectivesDataTypeController
+    : public sync_driver::UIDataTypeController,
+      public ProfileSyncServiceObserver {
+ public:
+  HistoryDeleteDirectivesDataTypeController(
+      sync_driver::SyncApiComponentFactory* factory,
+      ProfileSyncService* sync_service);
+
+  // UIDataTypeController override.
+  virtual bool ReadyForStart() const OVERRIDE;
+  virtual bool StartModels() OVERRIDE;
+  virtual void StopModels() OVERRIDE;
+
+  // ProfileSyncServiceBaseObserver implementation.
+  virtual void OnStateChanged() OVERRIDE;
+
+ private:
+  // Refcounted.
+  virtual ~HistoryDeleteDirectivesDataTypeController();
+
+  // Triggers a SingleDataTypeUnrecoverable error and returns true if the
+  // type is no longer ready, else does nothing and returns false.
+  bool DisableTypeIfNecessary();
+
+  ProfileSyncService* sync_service_;
+
+  DISALLOW_COPY_AND_ASSIGN(HistoryDeleteDirectivesDataTypeController);
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_GLUE_HISTORY_DELETE_DIRECTIVES_DATA_TYPE_CONTROLLER_H_