Remove all remaining traces of MessageLoopProxy.

chrome/browser/net/proxy_service_factory.cc

Index: chrome/browser/net/proxy_service_factory.cc
diff --git a/chrome/browser/net/proxy_service_factory.cc b/chrome/browser/net/proxy_service_factory.cc
index c67427c247ef97197d9e5bd54e1233e4b8df6f39..9197793ecf49dd603bb9d4e04568a5ad0c0d532b 100644
--- a/chrome/browser/net/proxy_service_factory.cc
+++ b/chrome/browser/net/proxy_service_factory.cc
@@ -76,8 +76,8 @@ ProxyServiceFactory::CreateProxyConfigService(PrefProxyConfigTracker* tracker) {
   // 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::FILE));
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::IO),
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE));
 #endif  // !defined(OS_CHROMEOS)
 
   return tracker->CreateTrackingProxyConfigService(std::move(base_service));
@@ -92,8 +92,7 @@ ProxyServiceFactory::CreatePrefProxyConfigTrackerOfProfile(
   return new chromeos::ProxyConfigServiceImpl(profile_prefs, local_state_prefs);
 #else
   return new PrefProxyConfigTrackerImpl(
-      profile_prefs,
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
+      profile_prefs, BrowserThread::GetTaskRunnerForThread(BrowserThread::IO));
 #endif  // defined(OS_CHROMEOS)
 }
 
@@ -106,7 +105,7 @@ ProxyServiceFactory::CreatePrefProxyConfigTrackerOfLocalState(
 #else
   return new PrefProxyConfigTrackerImpl(
       local_state_prefs,
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::IO));
 #endif  // defined(OS_CHROMEOS)
 }