ProcessSingleton now uses base::win::MessageWindow to create a message-only window.

win8/delegate_execute/command_execute_impl.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.
 // Implementation of the CommandExecuteImpl class which implements the
 // IExecuteCommand and related interfaces for handling ShellExecute based
 // launches of the Chrome browser.
 
 #include "win8/delegate_execute/command_execute_impl.h"
 
 #include <shlguid.h>
 
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/win/message_window.h"
 #include "base/win/registry.h"
 #include "base/win/scoped_co_mem.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/scoped_process_information.h"
 #include "base/win/win_util.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/installer/util/util_constants.h"
 #include "ui/base/clipboard/clipboard_util_win.h"
@@ skipping 221 matching lines @@
   if (!PathService::Get(chrome::DIR_USER_DATA, &user_data_dir))  {
     AtlTrace("Failed to get chrome's data dir path, E_FAIL\n");
     return E_FAIL;
   }
 
   bool decision_made = false;
 
   // New Aura/Ash world we don't want to go throgh FindWindow path
   // and instead take decision based on launch mode.
 #if !defined(USE_AURA)
-  HWND chrome_window = ::FindWindowEx(HWND_MESSAGE, NULL,
-                                      chrome::kMessageWindowClass,
-                                      user_data_dir.value().c_str());
+  HWND chrome_window = base::win::MessageWindow::FindWindow(
+      user_data_dir.value());
   if (chrome_window) {
     AtlTrace("Found chrome window %p\n", chrome_window);
     // The failure cases below are deemed to happen due to the inherently racy
     // procedure of going from chrome's window to process handle during which
     // chrome might have exited. Failing here would probably just cause the
     // user to retry at which point we would do the right thing.
     DWORD chrome_pid = 0;
     ::GetWindowThreadProcessId(chrome_window, &chrome_pid);
     if (!chrome_pid) {
       AtlTrace("Failed to get chrome's PID, E_FAIL\n");
@@ skipping 307 matching lines @@
     AtlTrace("Invalid registry launch mode value %u\n", reg_value);
     launch_mode = ECHUIM_DESKTOP;
   } else {
     launch_mode = static_cast<EC_HOST_UI_MODE>(reg_value);
     AtlTrace("Launch mode forced by registry to %s\n", modes[launch_mode]);
   }
 
   launch_mode_determined = true;
   return launch_mode;
 }