Remove remaining calls to deprecated MessageLoop methods on Mac.

chrome/app_shim/chrome_main_app_mode_mac.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // On Mac, one can't make shortcuts with command-line arguments. Instead, we
 // produce small app bundles which locate the Chromium framework and load it,
 // passing the appropriate data. This is the entry point into the framework for
 // those app bundles.
 
 #import <Cocoa/Cocoa.h>
@@ skipping 668 matching lines @@
     base::Callback<void(bool)> on_ping_chrome_reply =
         base::Bind(&AppShimController::OnPingChromeReply,
                    base::Unretained(&controller));
 
     // This code abuses the fact that Apple Events sent before the process is
     // fully initialized don't receive a reply until its run loop starts. Once
     // the reply is received, Chrome will have opened its IPC port, guaranteed.
     [ReplyEventHandler pingProcess:psn
                            andCall:on_ping_chrome_reply];
 
-    main_message_loop.PostDelayedTask(
-        FROM_HERE,
-        base::Bind(&AppShimController::OnPingChromeTimeout,
-                   base::Unretained(&controller)),
+    main_message_loop.task_runner()->PostDelayedTask(
+        FROM_HERE, base::Bind(&AppShimController::OnPingChromeTimeout,
+                              base::Unretained(&controller)),
         base::TimeDelta::FromSeconds(kPingChromeTimeoutSeconds));
   } else {
     // Chrome already running. Proceed to init. This could still fail if Chrome
     // is still starting up or shutting down, but the process will exit quickly,
     // which is preferable to waiting for the Apple Event to timeout after one
     // minute.
-    main_message_loop.PostTask(
+    main_message_loop.task_runner()->PostTask(
         FROM_HERE,
-        base::Bind(&AppShimController::Init,
-                   base::Unretained(&controller)));
+        base::Bind(&AppShimController::Init, base::Unretained(&controller)));
   }
 
   main_message_loop.Run();
   return 0;
 }