Revert "content: Remove use of MessageLoopProxy and deprecated MessageLoop APIs"

content/shell/browser/shell_url_request_context_getter.cc

Index: content/shell/browser/shell_url_request_context_getter.cc
diff --git a/content/shell/browser/shell_url_request_context_getter.cc b/content/shell/browser/shell_url_request_context_getter.cc
index cafda2de06448a5cec22cae201a3ac5115ed60aa..b6218aba6601ab3931c4fd3357934083f32c8b4b 100644
--- a/content/shell/browser/shell_url_request_context_getter.cc
+++ b/content/shell/browser/shell_url_request_context_getter.cc
@@ -6,7 +6,6 @@
 
 #include "base/command_line.h"
 #include "base/logging.h"
-#include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ -94,7 +93,7 @@ net::NetworkDelegate* ShellURLRequestContextGetter::CreateNetworkDelegate() {
 
 net::ProxyConfigService* ShellURLRequestContextGetter::GetProxyConfigService() {
   return net::ProxyService::CreateSystemProxyConfigService(
-      io_loop_->task_runner(), file_loop_->task_runner());
+      io_loop_->message_loop_proxy(), file_loop_->message_loop_proxy());
 }
 
 net::ProxyService* ShellURLRequestContextGetter::GetProxyService() {