Remove calls to deprecated MessageLoop methods on Windows and Linux.

ui/aura/demo/demo_main.cc

 // Copyright (c) 2012 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.
 
 #include <memory>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/power_monitor/power_monitor.h"
 #include "base/power_monitor/power_monitor_device_source.h"
+#include "base/run_loop.h"
 #include "build/build_config.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/aura/client/default_capture_client.h"
 #include "ui/aura/client/window_tree_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/test/test_focus_client.h"
 #include "ui/aura/test/test_screen.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura/window_tree_host.h"
@@ skipping 157 matching lines @@
   gfx::Rect window3_bounds(10, 10, 50, 50);
   DemoWindowDelegate window_delegate3(SK_ColorGREEN);
   aura::Window window3(&window_delegate3);
   window3.set_id(3);
   window3.Init(ui::LAYER_TEXTURED);
   window3.SetBounds(window3_bounds);
   window3.Show();
   window2.AddChild(&window3);
 
   host->Show();
-  base::MessageLoopForUI::current()->Run();
+  base::RunLoop().Run();
 
   return 0;
 }
 
 }  // namespace
 
 int main(int argc, char** argv) {
   base::CommandLine::Init(argc, argv);
 
   // The exit manager is in charge of calling the dtors of singleton objects.
   base::AtExitManager exit_manager;
 
   base::i18n::InitializeICU();
 
   return DemoMain();
 }