Remove MessageLoop::current()->task_runner() in ui.

ui/views/widget/native_widget_mac_unittest.mm

 // Copyright 2014 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 "ui/views/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
+#include "base/location.h"
 #import "base/mac/foundation_util.h"
 #import "base/mac/scoped_nsobject.h"
 #import "base/mac/scoped_nsautorelease_pool.h"
 #import "base/mac/scoped_objc_class_swizzler.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/test_timeouts.h"
+#include "base/threading/thread_task_runner_handle.h"
 #import "testing/gtest_mac.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #import "ui/base/cocoa/constrained_window/constrained_window_animation.h"
 #import "ui/base/cocoa/window_size_constants.h"
 #import "ui/base/test/scoped_fake_full_keyboard_access.h"
 #import "ui/events/test/cocoa_test_event_utils.h"
 #include "ui/events/test/event_generator.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
 #include "ui/views/bubble/bubble_dialog_delegate.h"
@@ skipping 159 matching lines @@
 
   void WaitForVisibleCounts(int gained, int lost) {
     if (gained_visible_count_ >= gained && lost_visible_count_ >= lost)
       return;
 
     target_gained_visible_count_ = gained;
     target_lost_visible_count_ = lost;
 
     base::RunLoop run_loop;
     run_loop_ = &run_loop;
-    base::MessageLoop::current()->task_runner()->PostDelayedTask(
+    base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE, run_loop.QuitClosure(), TestTimeouts::action_timeout());
     run_loop.Run();
     run_loop_ = nullptr;
   }
 
   int gained_visible_count() const { return gained_visible_count_; }
   int lost_visible_count() const { return lost_visible_count_; }
 
  private:
   // WidgetObserver:
@@ skipping 582 matching lines @@
 
   static IMP GetMethodAndMarkCalled() {
     return instance_->GetMethodInternal();
   }
 
   void WaitForMethod() {
     if (method_called_)
       return;
 
     base::RunLoop run_loop;
-    base::MessageLoop::current()->task_runner()->PostDelayedTask(
+    base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE, run_loop.QuitClosure(), TestTimeouts::action_timeout());
     run_loop_ = &run_loop;
     run_loop.Run();
     run_loop_ = nullptr;
   }
 
   bool method_called() const { return method_called_; }
 
  private:
   IMP GetMethodInternal() {
@@ skipping 838 matching lines @@
 
 - (void)dealloc {
   if (deallocFlag_) {
     DCHECK(!*deallocFlag_);
     *deallocFlag_ = true;
   }
   [super dealloc];
 }
 
 @end