The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ecea8e961951df9eacaa939ee512bc67ab43a48f

commit ecea8e961951df9eacaa939ee512bc67ab43a48f
Author: spqchan <spqchan@chromium.org>
Date: Mon May 22 23:13:32 2017

Remove the kHideFullscreenToolbar Preference

The preference is deprecated and has been replaced by
kShowFullscreenToolbar.

BUG= 590827 

Review-Url: https://codereview.chromium.org/2896763003
Cr-Commit-Position: refs/heads/master@{#473736}

[modify] https://crrev.com/ecea8e961951df9eacaa939ee512bc67ab43a48f/chrome/browser/prefs/browser_prefs.cc
[modify] https://crrev.com/ecea8e961951df9eacaa939ee512bc67ab43a48f/chrome/browser/ui/browser_ui_prefs.cc
[modify] https://crrev.com/ecea8e961951df9eacaa939ee512bc67ab43a48f/chrome/common/pref_names.cc
[modify] https://crrev.com/ecea8e961951df9eacaa939ee512bc67ab43a48f/chrome/common/pref_names.h