[Sync] Remove some http-related chrome deps from SyncBackendHostImpl.

chrome/browser/sync/profile_sync_test_util.cc

 // Copyright (c) 2011 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/profile_sync_test_util.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread.h"
 
 using content::BrowserThread;
 
+void EmptyNetworkTimeUpdate(const base::Time&,
+                            const base::TimeDelta&,
+                            const base::TimeDelta&) {}
+
 SyncServiceObserverMock::SyncServiceObserverMock() {
 }
 
 SyncServiceObserverMock::~SyncServiceObserverMock() {
 }
 
 ThreadNotifier::ThreadNotifier(base::Thread* notify_thread)
     : done_event_(false, false),
       notify_thread_(notify_thread) {}
 
@@ skipping 13 matching lines @@
 }
 
 ThreadNotifier::~ThreadNotifier() {}
 
 void ThreadNotifier::NotifyTask(int type,
                                 const content::NotificationSource& source,
                                 const content::NotificationDetails& details) {
   content::NotificationService::current()->Notify(type, source, details);
   done_event_.Signal();
 }