[Sync] Fix namespaces for the sync_sessions component.

chrome/browser/sync/glue/synced_window_delegates_getter_android.cc

 // 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.
 
 #include "chrome/browser/sync/glue/synced_window_delegates_getter_android.h"
 
 #include "chrome/browser/ui/android/tab_model/tab_model.h"
 #include "chrome/browser/ui/android/tab_model/tab_model_list.h"
 #include "components/sync_sessions/synced_window_delegate.h"
 
+using sync_sessions::SyncedWindowDelegate;
+
 namespace browser_sync {
 
 SyncedWindowDelegatesGetterAndroid::SyncedWindowDelegatesGetterAndroid() {}
 SyncedWindowDelegatesGetterAndroid::~SyncedWindowDelegatesGetterAndroid() {}
 
 std::set<const SyncedWindowDelegate*>
 SyncedWindowDelegatesGetterAndroid::GetSyncedWindowDelegates() {
   std::set<SyncedWindowDelegate const*> synced_window_delegates;
   for (auto i = TabModelList::begin(); i != TabModelList::end(); ++i) {
     synced_window_delegates.insert((*i)->GetSyncedWindowDelegate());
   }
   return synced_window_delegates;
 }
 
 const SyncedWindowDelegate* SyncedWindowDelegatesGetterAndroid::FindById(
     SessionID::id_type session_id) {
   TabModel* tab_model = TabModelList::FindTabModelWithId(session_id);
 
   // In case we don't find the browser (e.g. for Developer Tools).
   return tab_model ? tab_model->GetSyncedWindowDelegate() : nullptr;
 }
 
 }  // namespace browser_sync