Uses ProxyConfigServiceLinux in the chromoting host to configure proxy.

remoting/host/setup/start_host.cc

Index: remoting/host/setup/start_host.cc
diff --git a/remoting/host/setup/start_host.cc b/remoting/host/setup/start_host.cc
index 99580418dad8556dc55de9be0656b0f2bf87931c..ef4465505b9da2ecf22fc6fd542feb4e3e748a16 100644
--- a/remoting/host/setup/start_host.cc
+++ b/remoting/host/setup/start_host.cc
@@ -145,12 +145,15 @@ int main(int argc, char** argv) {
   // Provide message loops and threads for the URLRequestContextGetter.
   base::MessageLoop message_loop;
   g_message_loop = &message_loop;
-  base::Thread io_thread("IO thread");
   base::Thread::Options io_thread_options(base::MessageLoop::TYPE_IO, 0);
+  base::Thread io_thread("IO thread");
   io_thread.StartWithOptions(io_thread_options);
+  base::Thread file_thread("file thread");
+  file_thread.StartWithOptions(io_thread_options);
 
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter(
-      new remoting::URLRequestContextGetter(io_thread.message_loop_proxy()));
+      new remoting::URLRequestContextGetter(io_thread.task_runner(),
+                                            file_thread.task_runner()));
 
   net::URLFetcher::SetIgnoreCertificateRequests(true);