Move ProxyConfigService construction onto the IO thread.

chrome/browser/browser_process_impl.cc

 // Copyright (c) 2012 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/browser_process_impl.h"
 
 #include <algorithm>
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 153 matching lines @@
   ExtensionTabIdMap::GetInstance()->Init();
 }
 
 BrowserProcessImpl::~BrowserProcessImpl() {
   tracked_objects::ThreadData::EnsureCleanupWasCalled(4);
 
   g_browser_process = NULL;
 }
 
 void BrowserProcessImpl::StartTearDown() {
+  io_thread()->StartTearDown();
+
 #if defined(ENABLE_AUTOMATION)
   // Delete the AutomationProviderList before NotificationService,
   // since it may try to unregister notifications
   // Both NotificationService and AutomationProvider are singleton instances in
   // the BrowserProcess. Since AutomationProvider may have some active
   // notification observers, it is essential that it gets destroyed before the
   // NotificationService. NotificationService won't be destroyed until after
   // this destructor is run.
   automation_provider_list_.reset();
 #endif
@@ skipping 761 matching lines @@
 }
 
 void BrowserProcessImpl::OnAutoupdateTimer() {
   if (CanAutorestartForUpdate()) {
     DLOG(WARNING) << "Detected update.  Restarting browser.";
     RestartBackgroundInstance();
   }
 }
 
 #endif  // (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)