Cleanup: Remove unneeded includes of pref_names.h

chrome/browser/background_mode_manager_unittest.cc

 // Copyright (c) 2010 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 "base/command_line.h"
 #include "base/scoped_ptr.h"
 #include "chrome/browser/background_mode_manager.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/common/chrome_switches.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/test/testing_profile.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using testing::InSequence;
 
 class BackgroundModeManagerTest : public testing::Test {
  public:
   BackgroundModeManagerTest() {}
   ~BackgroundModeManagerTest() {}
@@ skipping 36 matching lines @@
   // and call to AppUninstalled() set chrome to not launch on startup.
   EXPECT_CALL(manager, EnableLaunchOnStartup(true));
   EXPECT_CALL(manager, CreateStatusTrayIcon());
   EXPECT_CALL(manager, RemoveStatusTrayIcon());
   EXPECT_CALL(manager, EnableLaunchOnStartup(false));
   manager.OnBackgroundAppInstalled();
   manager.OnBackgroundAppLoaded();
   manager.OnBackgroundAppUnloaded();
   manager.OnBackgroundAppUninstalled();
 }