Remove remaining calls to deprecated MessageLoop methods on Mac.

chrome/browser/ui/cocoa/location_bar/zoom_decoration_browsertest.mm

 // Copyright (c) 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/location_bar/zoom_decoration.h"
 
 #include "base/auto_reset.h"
 #include "base/macros.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_window.h"
 #import "chrome/browser/ui/cocoa/browser/zoom_bubble_controller.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h"
 #include "chrome/browser/ui/cocoa/run_loop_testing.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "components/toolbar/test_toolbar_model.h"
 #include "components/zoom/page_zoom.h"
@@ skipping 39 matching lines @@
     content::WebContents* web_contents =
         browser()->tab_strip_model()->GetActiveWebContents();
 
     base::AutoReset<bool> reset(&should_quit_on_zoom_, true);
     zoom::PageZoom::Zoom(web_contents, zoom);
     content::RunMessageLoop();
   }
 
   void OnZoomChanged(const content::HostZoomMap::ZoomLevelChange& host) {
     if (should_quit_on_zoom_) {
-      base::MessageLoop::current()->PostTask(
+      base::ThreadTaskRunnerHandle::Get()->PostTask(
           FROM_HERE,
           base::Bind(&base::MessageLoop::QuitWhenIdle,
                      base::Unretained(base::MessageLoop::current())));
     }
   }
 
  private:
   bool should_quit_on_zoom_;
   std::unique_ptr<content::HostZoomMap::Subscription> zoom_subscription_;
 
@@ skipping 77 matching lines @@
 
   // Create a new browser so that it can be closed properly.
   Browser* browser2 = CreateBrowser(browser()->profile());
   ZoomDecoration* zoom_decoration = GetZoomDecorationForBrowser(browser2);
   zoom_decoration->ShowBubble(true);
 
   // Test shouldn't crash.
   browser2->window()->Close();
   content::RunAllPendingInMessageLoop();
 }