[Sync] Introduce SyncedSessionWindow type.

components/sync_sessions/session_sync_test_helper.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 "components/sync_sessions/session_sync_test_helper.h"
 
 #include <stddef.h>
 
 #include "base/strings/utf_string_conversions.h"
 #include "components/sync/protocol/session_specifics.pb.h"
@@ skipping 44 matching lines @@
   ASSERT_EQ(kClientName, session.session_name);
   ASSERT_EQ(windows.size(), session.windows.size());
 
   // We assume the window id's are in increasing order.
   int i = 0;
   for (std::vector<std::vector<int>>::const_iterator win_iter = windows.begin();
        win_iter != windows.end(); ++win_iter, ++i) {
     sessions::SessionWindow* win_ptr;
     auto map_iter = session.windows.find(i);
     if (map_iter != session.windows.end())
-      win_ptr = map_iter->second.get();
+      win_ptr = &map_iter->second->wrapped_window;
     else
       FAIL();
     ASSERT_EQ(win_iter->size(), win_ptr->tabs.size());
     ASSERT_EQ(0, win_ptr->selected_tab_index);
     ASSERT_EQ(sessions::SessionWindow::TYPE_TABBED, win_ptr->type);
     int j = 0;
     for (auto tab_iter = (*win_iter).begin(); tab_iter != (*win_iter).end();
          ++tab_iter, ++j) {
       sessions::SessionTab* tab = win_ptr->tabs[j].get();
       ASSERT_EQ(*tab_iter, tab->tab_id.id());
@@ skipping 57 matching lines @@
   for (size_t i = 0; i < tab_list.size(); ++i) {
     BuildTabSpecifics(tag, 0, tab_list[i], &tabs1[i]);
   }
 
   if (tabs)
     tabs->swap(tabs1);
   return meta;
 }
 
 }  // namespace sync_sessions