Initialize the message center as part of the testing browser process

chrome/browser/background/background_contents_service_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 "chrome/browser/background/background_contents_service.h"
 
 #include <memory>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 162 matching lines @@
 
 class BackgroundContentsServiceNotificationTest
     : public BrowserWithTestWindowTest {
  public:
   BackgroundContentsServiceNotificationTest() {}
   ~BackgroundContentsServiceNotificationTest() override {}
 
   // Overridden from testing::Test
   void SetUp() override {
     BrowserWithTestWindowTest::SetUp();
-    // In ChromeOS environment, BrowserWithTestWindowTest initializes
-    // MessageCenter.
-#if !defined(OS_CHROMEOS)
-    message_center::MessageCenter::Initialize();
-#endif
     profile_manager_.reset(new TestingProfileManager(
         TestingBrowserProcess::GetGlobal()));
     ASSERT_TRUE(profile_manager_->SetUp());
     MessageCenterNotificationManager* manager =
         static_cast<MessageCenterNotificationManager*>(
             g_browser_process->notification_ui_manager());
     manager->SetMessageCenterTrayDelegateForTest(
         new message_center::FakeMessageCenterTrayDelegate(
             message_center::MessageCenter::Get()));
   }
 
   void TearDown() override {
     g_browser_process->notification_ui_manager()->CancelAll();
     profile_manager_.reset();
-#if !defined(OS_CHROMEOS)
-    message_center::MessageCenter::Shutdown();
-#endif
     BrowserWithTestWindowTest::TearDown();
   }
 
  protected:
   // Creates crash notification for the specified extension and returns
   // the created one.
   const Notification* CreateCrashNotification(
       scoped_refptr<extensions::Extension> extension) {
     std::string notification_id = BackgroundContentsService::
         GetNotificationDelegateIdForExtensionForTesting(extension->id());
@@ skipping 199 matching lines @@
   CreateCrashNotification(extension);
   CreateCrashNotification(extension);
 
   message_center::MessageCenter* message_center =
       message_center::MessageCenter::Get();
   message_center::NotificationList::Notifications notifications =
       message_center->GetVisibleNotifications();
   ASSERT_EQ(1u, notifications.size());
 }
 #endif