Make browsing_data component a layered component

components/browsing_data/pref_names.cc

Index: components/browsing_data/pref_names.cc
diff --git a/components/browsing_data/pref_names.cc b/components/browsing_data/pref_names.cc
deleted file mode 100644
index c4cb874a7fc44c477c967e98ed0027fe84386f17..0000000000000000000000000000000000000000
--- a/components/browsing_data/pref_names.cc
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright 2016 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 "components/browsing_data/pref_names.h"
-
-namespace browsing_data {
-
-namespace prefs {
-
-// Clear browsing data deletion time period.
-const char kDeleteTimePeriod[] = "browser.clear_data.time_period";
-
-// Clear Browsing Data dialog datatype preferences.
-const char kDeleteBrowsingHistory[] = "browser.clear_data.browsing_history";
-const char kDeleteDownloadHistory[] = "browser.clear_data.download_history";
-const char kDeleteCache[] = "browser.clear_data.cache";
-const char kDeleteCookies[] = "browser.clear_data.cookies";
-const char kDeletePasswords[] = "browser.clear_data.passwords";
-const char kDeleteFormData[] = "browser.clear_data.form_data";
-const char kDeleteHostedAppsData[] = "browser.clear_data.hosted_apps_data";
-const char kDeleteMediaLicenses[] = "browser.clear_data.media_licenses";
-
-}  // namespace prefs
-
-}  // namespace browsing_data