Cleanup: Remove unneeded chrome/common/pref_names.h includes.

chrome/browser/extensions/api/management/management_browsertest.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 "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/ref_counted.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/run_loop.h"
 #include "base/stl_util.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_management.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/updater/extension_updater.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "components/policy/core/browser/browser_policy_connector.h"
 #include "components/policy/core/common/mock_configuration_policy_provider.h"
 #include "components/policy/core/common/policy_map.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/test/browser_test_utils.h"
 #include "extensions/browser/extension_host.h"
@@ skipping 677 matching lines @@
   UpdateProviderPolicy(policies);
 
   ASSERT_TRUE(WaitForExtensionInstall());
   ASSERT_EQ(size_before + 1, registry->enabled_extensions().size());
   extension = service->GetExtensionById(kExtensionId, false);
   ASSERT_TRUE(extension);
   EXPECT_EQ(Manifest::EXTERNAL_POLICY_DOWNLOAD, extension->location());
   EXPECT_TRUE(service->IsExtensionEnabled(kExtensionId));
   EXPECT_TRUE(registry->disabled_extensions().is_empty());
 }