Move constants back from FeatureUtilities to ChromePreferenceKeys.

All SharedPreferences keys used in Chrome should be in ChromePreferenceKeys.

Also update some outdated documentation in FeatureUtilities.

Bug: 1022108
Change-Id: I7b15797e50c8862d10cdf0675852c8e25278d7ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1914976
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716787}
2 files changed