Fixing crash upon window manager creation

chrome/browser/chromeos/extensions/wallpaper_private_api_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.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/test_session_state_delegate.h"
 #include "ash/test/test_shell_delegate.h"
 #include "ash/wm/window_state.h"
 #include "base/command_line.h"
@@ skipping 205 matching lines @@
 void WallpaperPrivateApiMultiUserUnittest::TearDown() {
   chrome::MultiUserWindowManager::DeleteInstance();
   AshTestBase::TearDown();
 }
 
 void WallpaperPrivateApiMultiUserUnittest::SetUpMultiUserWindowManager(
     const std::string& active_user_id,
     chrome::MultiUserWindowManager::MultiProfileMode mode) {
   multi_user_window_manager_ =
       new chrome::MultiUserWindowManagerChromeOS(active_user_id);
+  multi_user_window_manager_->Init();
   chrome::MultiUserWindowManager::SetInstanceForTest(
       multi_user_window_manager_, mode);
   // We do not want animations while the test is going on.
   multi_user_window_manager_->SetAnimationSpeedForTest(
       chrome::MultiUserWindowManagerChromeOS::ANIMATION_SPEED_DISABLED);
   EXPECT_TRUE(multi_user_window_manager_);
 }
 
 void WallpaperPrivateApiMultiUserUnittest::SwitchActiveUser(
     const std::string& active_user_id) {
@@ skipping 156 matching lines @@
   scoped_refptr<TestRestoreFunction> restore_function_1(
       new TestRestoreFunction());
   EXPECT_TRUE(restore_function_1->RunAsync());
 
   EXPECT_FALSE(window1_state->IsMinimized());
   EXPECT_FALSE(window2_state->IsMinimized());
   EXPECT_FALSE(window3_state->IsMinimized());
 }
 
 }  // namespace chromeos