[Sync] Introduce SyncedSessionWindow type.

chrome/browser/extensions/api/sessions/sessions_api.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/extensions/api/sessions/sessions_api.h"
 
 #include <stddef.h>
 
 #include <utility>
 #include <vector>
@@ skipping 318 matching lines @@
 
   api::sessions::Device device_struct;
   device_struct.info = session->session_name;
   device_struct.device_name = session->session_name;
 
   for (auto it = session->windows.begin();
        it != session->windows.end() &&
        static_cast<int>(device_struct.sessions.size()) < max_results;
        ++it) {
     std::unique_ptr<api::sessions::Session> session_model(
-        CreateSessionModel(*it->second, session->session_tag));
+        CreateSessionModel(it->second->wrapped_window, session->session_tag));
     if (session_model)
       device_struct.sessions.push_back(std::move(*session_model));
   }
   return device_struct;
 }
 
 ExtensionFunction::ResponseAction SessionsGetDevicesFunction::Run() {
   browser_sync::ProfileSyncService* service =
       ProfileSyncServiceFactory::GetInstance()->GetForProfile(
           Profile::FromBrowserContext(browser_context()));
@@ skipping 252 matching lines @@
   return g_factory.Pointer();
 }
 
 void SessionsAPI::OnListenerAdded(const EventListenerInfo& details) {
   sessions_event_router_.reset(
       new SessionsEventRouter(Profile::FromBrowserContext(browser_context_)));
   EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 }  // namespace extensions