The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3f3a82a702e443ed80e1fd38168f68c95b22506d

commit 3f3a82a702e443ed80e1fd38168f68c95b22506d
Author: Tim Song <tengs@chromium.org>
Date: Thu Aug 17 23:56:28 2017

[EasyUnlock] Clear cryptohome keys after user disables the login flow.

After disabling the login flow in chrome://settings, the cryptohome keys for
EasyUnlock will be cleared, so only the password can be used to decrypt the user
data.

BUG= 754865 

Change-Id: Ia68fbcf39e849ae6352994a8f459136ad7de19de
Reviewed-on: https://chromium-review.googlesource.com/612046
Commit-Queue: Tim Song <tengs@chromium.org>
Reviewed-by: Gustavo Sacomoto <sacomoto@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#495389}
[modify] https://crrev.com/3f3a82a702e443ed80e1fd38168f68c95b22506d/chrome/browser/chromeos/login/easy_unlock/easy_unlock_refresh_keys_operation.cc
[modify] https://crrev.com/3f3a82a702e443ed80e1fd38168f68c95b22506d/chrome/browser/chromeos/login/easy_unlock/easy_unlock_refresh_keys_operation.h
[modify] https://crrev.com/3f3a82a702e443ed80e1fd38168f68c95b22506d/chrome/browser/chromeos/login/session/user_session_manager.cc
[modify] https://crrev.com/3f3a82a702e443ed80e1fd38168f68c95b22506d/chrome/browser/signin/easy_unlock_service.cc
[modify] https://crrev.com/3f3a82a702e443ed80e1fd38168f68c95b22506d/chrome/browser/signin/easy_unlock_service.h
[modify] https://crrev.com/3f3a82a702e443ed80e1fd38168f68c95b22506d/chrome/browser/signin/easy_unlock_service_regular.cc
[modify] https://crrev.com/3f3a82a702e443ed80e1fd38168f68c95b22506d/chrome/browser/signin/easy_unlock_service_regular.h
[modify] https://crrev.com/3f3a82a702e443ed80e1fd38168f68c95b22506d/chrome/browser/signin/easy_unlock_service_signin_chromeos.cc
[modify] https://crrev.com/3f3a82a702e443ed80e1fd38168f68c95b22506d/chrome/browser/signin/easy_unlock_service_signin_chromeos.h

Approving merge to M61 Chrome OS.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c4a3f5b5e62ac05042d31842c2bf9a0dd9de3123

commit c4a3f5b5e62ac05042d31842c2bf9a0dd9de3123
Author: Tim Song <tengs@chromium.org>
Date: Fri Aug 18 20:27:48 2017

[EasyUnlock] Clear cryptohome keys after user disables the login flow.

After disabling the login flow in chrome://settings, the cryptohome keys for
EasyUnlock will be cleared, so only the password can be used to decrypt the user
data.

BUG= 754865 
TBR=tengs@chromium.org

(cherry picked from commit 3f3a82a702e443ed80e1fd38168f68c95b22506d)

Change-Id: Ia68fbcf39e849ae6352994a8f459136ad7de19de
Reviewed-on: https://chromium-review.googlesource.com/612046
Commit-Queue: Tim Song <tengs@chromium.org>
Reviewed-by: Gustavo Sacomoto <sacomoto@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#495389}
Reviewed-on: https://chromium-review.googlesource.com/621868
Reviewed-by: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/branch-heads/3163@{#681}
Cr-Branched-From: ff259bab28b35d242e10186cd63af7ed404fae0d-refs/heads/master@{#488528}
[modify] https://crrev.com/c4a3f5b5e62ac05042d31842c2bf9a0dd9de3123/chrome/browser/chromeos/login/easy_unlock/easy_unlock_refresh_keys_operation.cc
[modify] https://crrev.com/c4a3f5b5e62ac05042d31842c2bf9a0dd9de3123/chrome/browser/chromeos/login/easy_unlock/easy_unlock_refresh_keys_operation.h
[modify] https://crrev.com/c4a3f5b5e62ac05042d31842c2bf9a0dd9de3123/chrome/browser/chromeos/login/session/user_session_manager.cc
[modify] https://crrev.com/c4a3f5b5e62ac05042d31842c2bf9a0dd9de3123/chrome/browser/signin/easy_unlock_service.cc
[modify] https://crrev.com/c4a3f5b5e62ac05042d31842c2bf9a0dd9de3123/chrome/browser/signin/easy_unlock_service.h
[modify] https://crrev.com/c4a3f5b5e62ac05042d31842c2bf9a0dd9de3123/chrome/browser/signin/easy_unlock_service_regular.cc
[modify] https://crrev.com/c4a3f5b5e62ac05042d31842c2bf9a0dd9de3123/chrome/browser/signin/easy_unlock_service_regular.h
[modify] https://crrev.com/c4a3f5b5e62ac05042d31842c2bf9a0dd9de3123/chrome/browser/signin/easy_unlock_service_signin_chromeos.cc
[modify] https://crrev.com/c4a3f5b5e62ac05042d31842c2bf9a0dd9de3123/chrome/browser/signin/easy_unlock_service_signin_chromeos.h