Use scoped_refptr<SingleThreadTaskRunner> when initializing ProxyConfigService

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 2c4e9b7f311527a45b9358269fad5295ce2eff8a..0d2be36240de17948d4f7b618c5df0ecb807b9ef 100644
--- a/chrome/browser/net/proxy_service_factory.cc
+++ b/chrome/browser/net/proxy_service_factory.cc
@@ -54,8 +54,8 @@ net::ProxyConfigService* ProxyServiceFactory::CreateProxyConfigService(
   // 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.reset(net::ProxyService::CreateSystemProxyConfigService(
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO).get(),
-      BrowserThread::UnsafeGetMessageLoopForThread(BrowserThread::FILE)));
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO),
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)));
 #endif  // !defined(OS_CHROMEOS)
 
   return tracker->CreateTrackingProxyConfigService(base_service.Pass())