Fan Zhang 57ef92a810 Eliminate duplicate keys in pref xmls.
- Remove additional_system_update pref device_info page, we don't need
  it.
- Update keys in xml and Preference controller, and search index
  provider.
- Clean up in ScreenZoomPreference, it's anti-pattern to set fragment in
  constructor.
- Whitelist 2 that are super hard to remove.

Change-Id: Ibab6e2cb074513042a2ae007d9085aa64046eec8
Fixes: 67852637
Test: uniquePreferenceTest
2017-10-28 11:06:37 -07:00
2015-04-13 09:21:39 -07:00
2017-10-13 15:59:03 -07:00
2017-09-18 17:01:23 -07:00
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