Move ProxyConfigService construction onto the IO thread.

chrome/browser/net/proxy_service_factory.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/net/proxy_service_factory.h"
 
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
 #include "base/threading/thread.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 11 matching lines @@
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/proxy_config_service_impl.h"
 #endif  // defined(OS_CHROMEOS)
 
 using content::BrowserThread;
 
 // static
 ChromeProxyConfigService* ProxyServiceFactory::CreateProxyConfigService(
     bool wait_for_first_update) {
-  // The linux gconf-based proxy settings getter relies on being initialized
-  // from the UI thread.
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   net::ProxyConfigService* base_service = NULL;
 
 #if !defined(OS_CHROMEOS)
   // On ChromeOS, base service is NULL; chromeos::ProxyConfigServiceImpl
   // determines the effective proxy config to take effect in the network layer,
   // be it from prefs or system (which is network shill on chromeos).
 
   // For other platforms, create a baseline service that provides proxy
   // configuration in case nothing is configured through prefs (Note: prefs
   // include command line and configuration policy).
 
   // TODO(port): the IO and FILE message loops are only used by Linux.  Can
   // that code be moved to chrome/browser instead of being in net, so that it
   // can use BrowserThread instead of raw MessageLoop pointers? See bug 25354.
   base_service = net::ProxyService::CreateSystemProxyConfigService(
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO),
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI),
       BrowserThread::UnsafeGetMessageLoopForThread(BrowserThread::FILE));
 #endif  // !defined(OS_CHROMEOS)
 
   return new ChromeProxyConfigService(base_service, wait_for_first_update);
 }
 
 #if defined(OS_CHROMEOS)
 // static
 chromeos::ProxyConfigServiceImpl*
     ProxyServiceFactory::CreatePrefProxyConfigTracker(
@@ skipping 65 matching lines @@
 #endif  // defined(OS_IOS)
   } else {
     proxy_service = net::ProxyService::CreateUsingSystemProxyResolver(
         proxy_config_service,
         num_pac_threads,
         net_log);
   }
 
   return proxy_service;
 }