I would like to fix this issue if no one working on this.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6e7d226c7a576e4b90de8460df4f11cff2e3cd0a

commit 6e7d226c7a576e4b90de8460df4f11cff2e3cd0a
Author: Jaeyong Bae <jdragon.bae@gmail.com>
Date: Fri Oct 12 14:12:40 2018

Remove prefs::kReverseAutologinEnabled & DisableOneClickSignIn

This patch means removing the preference and functions
that reference it.
Because preference is set but never read, that is indeed obsolete.

Bug:  889908 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I22a80bed2387b08480dae9c930bb1d329dd8c45d
Reviewed-on: https://chromium-review.googlesource.com/c/1264343
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599200}
[modify] https://crrev.com/6e7d226c7a576e4b90de8460df4f11cff2e3cd0a/chrome/browser/prefs/browser_prefs.cc
[modify] https://crrev.com/6e7d226c7a576e4b90de8460df4f11cff2e3cd0a/chrome/browser/ui/webui/signin/inline_login_ui_browsertest.cc
[modify] https://crrev.com/6e7d226c7a576e4b90de8460df4f11cff2e3cd0a/components/signin/core/browser/signin_manager.cc
[modify] https://crrev.com/6e7d226c7a576e4b90de8460df4f11cff2e3cd0a/components/signin/core/browser/signin_manager.h
[modify] https://crrev.com/6e7d226c7a576e4b90de8460df4f11cff2e3cd0a/components/signin/core/browser/signin_manager_base.cc
[modify] https://crrev.com/6e7d226c7a576e4b90de8460df4f11cff2e3cd0a/components/signin/core/browser/signin_pref_names.cc
[modify] https://crrev.com/6e7d226c7a576e4b90de8460df4f11cff2e3cd0a/components/signin/core/browser/signin_pref_names.h
[modify] https://crrev.com/6e7d226c7a576e4b90de8460df4f11cff2e3cd0a/ios/chrome/browser/prefs/browser_prefs.mm