Remove remaining calls to deprecated MessageLoop methods on Mac.

chrome/browser/ui/cocoa/apps/app_shim_menu_controller_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.
 
 #import "chrome/browser/ui/cocoa/apps/app_shim_menu_controller_mac.h"
 
 #include "base/command_line.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h"
 #include "chrome/browser/apps/app_window_registry_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #import "chrome/browser/ui/cocoa/apps/native_app_window_cocoa.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/grit/generated_resources.h"
 #include "extensions/browser/app_window/app_window.h"
@@ skipping 507 matching lines @@
 - (void)appBecameMain:(const Extension*)app {
   if (appId_ == app->id())
     return;
 
   if (!appId_.empty())
     [self removeMenuItems];
 
   appId_ = app->id();
   [self addMenuItems:app];
   if (IsAppWindowCyclingEnabled()) {
-    base::MessageLoop::current()->PostTask(
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(&SetAppCyclesWindows, appId_,
                               ++g_window_cycle_sequence_number));
   }
 }
 
 - (void)chromeBecameMain {
   if (appId_.empty())
     return;
 
   appId_.clear();
   [self removeMenuItems];
   if (IsAppWindowCyclingEnabled()) {
-    base::MessageLoop::current()->PostTask(
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::Bind(&SetChromeCyclesWindows, ++g_window_cycle_sequence_number));
   }
 }
 
 - (void)addMenuItems:(const Extension*)app {
   DCHECK_EQ(appId_, app->id());
   NSString* title = base::SysUTF8ToNSString(app->name());
 
   // Hide Chrome menu items.
@@ skipping 85 matching lines @@
 
 - (void)focusCurrentPlatformApp {
   extensions::AppWindow* appWindow =
       AppWindowRegistryUtil::GetAppWindowForNativeWindowAnyProfile(
           [NSApp keyWindow]);
   if (appWindow)
     apps::ExtensionAppShimHandler::FocusAppForWindow(appWindow);
 }
 
 @end