Add SocketWatcherFactory as a helper class to NQE

ios/chrome/browser/browser_state/chrome_browser_state_io_data.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 "ios/chrome/browser/browser_state/chrome_browser_state_io_data.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 444 matching lines @@
 ChromeBrowserStateIOData::CreateHttpNetworkSession(
     const ProfileParams& profile_params) const {
   net::HttpNetworkSession::Params params;
   net::URLRequestContext* context = main_request_context();
 
   IOSChromeIOThread* const io_thread = profile_params.io_thread;
 
   io_thread->InitializeNetworkSessionParams(&params);
   net::URLRequestContextBuilder::SetHttpNetworkSessionComponents(context,
                                                                  &params);
-  if (!IsOffTheRecord()) {
+  if (!IsOffTheRecord() && io_thread->globals()->network_quality_estimator) {
     params.socket_performance_watcher_factory =
-        io_thread->globals()->network_quality_estimator.get();
+        io_thread->globals()
+            ->network_quality_estimator->GetSocketPerformanceWatcherFactory();
   }
 
   return scoped_ptr<net::HttpNetworkSession>(
       new net::HttpNetworkSession(params));
 }
 
 scoped_ptr<net::HttpCache> ChromeBrowserStateIOData::CreateMainHttpFactory(
     net::HttpNetworkSession* session,
     scoped_ptr<net::HttpCache::BackendFactory> main_backend) const {
   return scoped_ptr<net::HttpCache>(
       new net::HttpCache(session, std::move(main_backend), true));
 }
 
 scoped_ptr<net::HttpCache> ChromeBrowserStateIOData::CreateHttpFactory(
     net::HttpNetworkSession* shared_session,
     scoped_ptr<net::HttpCache::BackendFactory> backend) const {
   return scoped_ptr<net::HttpCache>(
       new net::HttpCache(shared_session, std::move(backend), true));
 }