[sync] WebContentsObserver based sessions notifications

components/sync_sessions/sessions_sync_manager.h

 // 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 COMPONENTS_SYNC_SESSIONS_SESSIONS_SYNC_MANAGER_H_
 #define COMPONENTS_SYNC_SESSIONS_SESSIONS_SYNC_MANAGER_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 44 matching lines @@
 
 // Contains all logic for associating the Chrome sessions model and
 // the sync sessions model.
 class SessionsSyncManager : public syncer::SyncableService,
                             public OpenTabsUIDelegate,
                             public LocalSessionEventHandler {
  public:
   SessionsSyncManager(SyncSessionsClient* sessions_client,
                       syncer::SyncPrefs* sync_prefs,
                       syncer::LocalDeviceInfoProvider* local_device,
-                      std::unique_ptr<LocalSessionEventRouter> router,
+                      LocalSessionEventRouter* router,
                       const base::Closure& sessions_updated_callback,
                       const base::Closure& datatype_refresh_callback);
   ~SessionsSyncManager() override;
 
   // syncer::SyncableService implementation.
   syncer::SyncMergeResult MergeDataAndStartSyncing(
       syncer::ModelType type,
       const syncer::SyncDataList& initial_sync_data,
       std::unique_ptr<syncer::SyncChangeProcessor> sync_processor,
       std::unique_ptr<syncer::SyncErrorFactory> error_handler) override;
@@ skipping 226 matching lines @@
   sync_pb::SyncEnums::DeviceType current_device_type_;
 
   // SyncID for the sync node containing all the window information for this
   // client.
   int local_session_header_node_id_;
 
   // Number of days without activity after which we consider a session to be
   // stale and a candidate for garbage collection.
   int stale_session_threshold_days_;
 
-  std::unique_ptr<LocalSessionEventRouter> local_event_router_;
+  LocalSessionEventRouter* local_event_router_;
 
   // Owns revisiting instrumentation logic for page visit events.
   PageRevisitBroadcaster page_revisit_broadcaster_;
 
   std::unique_ptr<sync_sessions::LostNavigationsRecorder>
       lost_navigations_recorder_;
 
   // Callback to inform interested observer that new sessions data has arrived.
   base::Closure sessions_updated_callback_;
 
   // Callback to inform sync that a sync data refresh is requested.
   base::Closure datatype_refresh_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionsSyncManager);
 };
 
 }  // namespace sync_sessions
 
 #endif  // COMPONENTS_SYNC_SESSIONS_SESSIONS_SYNC_MANAGER_H_