Componentize //chrome/browser/prefs/tracked.

components/user_prefs/tracked/pref_names.h

Index: components/user_prefs/tracked/pref_names.h
diff --git a/components/user_prefs/tracked/pref_names.h b/components/user_prefs/tracked/pref_names.h
new file mode 100644
index 0000000000000000000000000000000000000000..1599cbb35905f105eefefbe901220065d2b7a293
--- /dev/null
+++ b/components/user_prefs/tracked/pref_names.h
@@ -0,0 +1,14 @@
+// Copyright 2015 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_USER_PREFS_TRACKED_PREF_NAMES_H_
+#define COMPONENTS_USER_PREFS_TRACKED_PREF_NAMES_H_
+
+namespace user_prefs_prefs {

[gab, 2015/07/29 18:12:14]

user_prefs_prefs sounds very weird to me... can you think of something better?

[Jitu( very slow this week), 2015/07/30 08:06:13]

How about 
-- prefs ( simple)
-- user_prefs
-- user_prefs_tracked

[gab, 2015/07/30 15:38:33]

Looking at the trend @ [1], looks like either just use "prefs" or a "prefs"
subnamespace inside the component's namespace, e.g. user_prefs::prefs::.

I think I prefer the former, simpler form.

[1]
https://code.google.com/p/chromium/codesearch#search/&q=components/.*pref_nam...

[Jitu( very slow this week), 2015/08/03 07:55:13]

Done.

+
+extern const char kPreferenceResetTime[];
+
+}  // namespace prefs
+
+#endif  // COMPONENTS_USER_PREFS_TRACKED_PREF_NAMES_H_