[sync] WebContentsObserver based sessions notifications

components/sync_sessions/sync_sessions_client.h

 // Copyright 2015 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_SYNC_SESSIONS_CLIENT_H_
 #define COMPONENTS_SYNC_SESSIONS_SYNC_SESSIONS_CLIENT_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 34 matching lines @@
   // files, and chrome internal pages.
   // TODO(zea): make this a standalone function if the url constants are
   // componentized.
   virtual bool ShouldSyncURL(const GURL& url) const = 0;
 
   // Returns the SyncedWindowDelegatesGetter for this client.
   virtual SyncedWindowDelegatesGetter* GetSyncedWindowDelegatesGetter() = 0;
 
   // Returns a LocalSessionEventRouter instance that is customized for the
   // embedder's context.
-  virtual std::unique_ptr<LocalSessionEventRouter>
-  GetLocalSessionEventRouter() = 0;
+  virtual LocalSessionEventRouter* GetLocalSessionEventRouter() = 0;
 
   // TODO(zea): add getters for the history and favicon services for the favicon
   // cache to consume once it's componentized.
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncSessionsClient);
 };
 
 }  // namespace sync_sessions
 
 #endif  // COMPONENTS_SYNC_SESSIONS_SYNC_SESSIONS_CLIENT_H_