Reverted metro exit sequence back to original one.

win8/metro_driver/chrome_app_view_ash.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 "win8/metro_driver/stdafx.h"
 #include "win8/metro_driver/chrome_app_view_ash.h"
 
 #include <corewindow.h>
 #include <shellapi.h>
 #include <windows.foundation.h>
@@ skipping 907 matching lines @@
 // then we try and exit by sending an Alt+F4 key combination to the core
 // window which ensures that the chrome application tile does not show up in
 // the running metro apps list on the top left corner.
 void ChromeAppViewAsh::OnMetroExit(MetroTerminateMethod method) {
   if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
     HWND core_window = core_window_hwnd();
     if (method == TERMINATE_USING_KEY_SEQUENCE && core_window != NULL &&
         core_window == ::GetForegroundWindow()) {
       DVLOG(1) << "We are in the foreground. Exiting via Alt F4";
       SendKeySequence(VK_F4, ALT);
+      if (ui_channel_)
+        ui_channel_->Close();
+    } else {
+      globals.app_exit->Exit();
     }
+  } else {
+    if (ui_channel_)
+      ui_channel_->Close();
+
+    globals.app_exit->Exit();
   }
-  if (ui_channel_)
-    ui_channel_->Close();
-
-  globals.app_exit->Exit();
 }
 
 void ChromeAppViewAsh::OnInputSourceChanged() {
   if (!input_source_)
     return;
 
   LANGID langid = 0;
   bool is_ime = false;
   if (!input_source_->GetActiveSource(&langid, &is_ime)) {
     LOG(ERROR) << "GetActiveSource failed";
@@ skipping 406 matching lines @@
   mswr::ComPtr<winapp::Core::ICoreApplicationExit> app_exit;
   CheckHR(core_app.As(&app_exit));
   globals.app_exit = app_exit.Detach();
 }
 
 IFACEMETHODIMP
 ChromeAppViewFactory::CreateView(winapp::Core::IFrameworkView** view) {
   *view = mswr::Make<ChromeAppViewAsh>().Detach();
   return (*view) ? S_OK :  E_OUTOFMEMORY;
 }