Moved BrowsingDataCounter and part of BrowsingDataCounterUtils to components.

components/browsing_data/pref_names.h

Index: components/browsing_data/pref_names.h
diff --git a/components/browsing_data/pref_names.h b/components/browsing_data/pref_names.h
new file mode 100644
index 0000000000000000000000000000000000000000..16f20fe913cedc53218c8307a8143f62643c4c59
--- /dev/null
+++ b/components/browsing_data/pref_names.h
@@ -0,0 +1,16 @@
+// 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.
+
+#ifndef COMPONENTS_BROWSING_DATA_PREF_NAMES_H_
+#define COMPONENTS_BROWSING_DATA_PREF_NAMES_H_
+
+namespace browsing_data {
+
+namespace prefs {
+extern const char kDeleteTimePeriod[];
+}  // namespace prefs
+
+}  // namespace browsing_data
+
+#endif  // COMPONENTS_BROWSING_DATA_PREF_NAMES_H_