chrome/browser: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

chrome/browser/apps/app_shim/app_shim_host_manager_browsertest_mac.mm

Index: chrome/browser/apps/app_shim/app_shim_host_manager_browsertest_mac.mm
diff --git a/chrome/browser/apps/app_shim/app_shim_host_manager_browsertest_mac.mm b/chrome/browser/apps/app_shim/app_shim_host_manager_browsertest_mac.mm
index 2e88b1b221280daf7d5f05f0389aed297e26bbf9..e76f5aad1ebe2b0bcae1a7bf04db51d21cb069bc 100644
--- a/chrome/browser/apps/app_shim/app_shim_host_manager_browsertest_mac.mm
+++ b/chrome/browser/apps/app_shim/app_shim_host_manager_browsertest_mac.mm
@@ -65,10 +65,8 @@ TestShimClient::TestShimClient() : io_thread_("TestShimClientIO") {
   app_mode::VerifySocketPermissions(socket_path);
 
   IPC::ChannelHandle handle(socket_path.value());
-  channel_ = IPC::ChannelProxy::Create(handle,
-                                       IPC::Channel::MODE_NAMED_CLIENT,
-                                       this,
-                                       io_thread_.message_loop_proxy().get());
+  channel_ = IPC::ChannelProxy::Create(handle, IPC::Channel::MODE_NAMED_CLIENT,
+                                       this, io_thread_.task_runner().get());
 }
 
 TestShimClient::~TestShimClient() {}