Makes construction of (ash)RemoteWindowTreeHostWin explicit

ash/shell/window_watcher_unittest.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 "ash/shell/window_watcher.h"
 
 #include "ash/shell.h"
+#include "ash/shell/shell_delegate_impl.h"
 #include "ash/shell_delegate.h"
-#include "ash/shell/shell_delegate_impl.h"
+#include "ash/shell_init_params.h"
 #include "ash/system/user/login_status.h"
 #include "ash/test/ash_test_base.h"
 #include "ui/aura/window_tree_host.h"
 
 namespace ash {
 
 typedef test::AshTestBase WindowWatcherTest;
 
 // This test verifies that shell can be torn down without causing failures
 // bug http://code.google.com/p/chromium/issues/detail?id=130332
 TEST_F(WindowWatcherTest, ShellDeleteInstance) {
   RunAllPendingInMessageLoop();
   scoped_ptr<ash::shell::WindowWatcher> window_watcher;
   Shell::DeleteInstance();
 
   shell::ShellDelegateImpl* delegate = new ash::shell::ShellDelegateImpl;
-  Shell::CreateInstance(delegate);
+  ash::ShellInitParams init_params;
+  init_params.delegate = delegate;
+  Shell::CreateInstance(init_params);
   Shell::GetPrimaryRootWindow()->GetHost()->Show();
   Shell::GetInstance()->CreateShelf();
   Shell::GetInstance()->UpdateAfterLoginStatusChange(
       user::LOGGED_IN_USER);
 
   window_watcher.reset(new ash::shell::WindowWatcher);
 
   delegate->SetWatcher(window_watcher.get());
   Shell::GetPrimaryRootWindow()->Hide();
   window_watcher.reset();
   delegate->SetWatcher(NULL);
 }
 
 }  // namespace ash