The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/221fd61a7840570e74eb9e8a71c48b6bf8000142

commit 221fd61a7840570e74eb9e8a71c48b6bf8000142
Author: Pavol Marko <pmarko@chromium.org>
Date: Thu Jul 27 14:07:42 2017

Use CachedPolicyKeyLoaderChromeOS from UserCloudPolicyStoreChromeOS

Use CachedPolicyKeyLoaderChromeOS to load the cached policy key
provided by session_manager in UserCloudPolicyStoreChromeOS.
CachedPolicyKeyLoaderChromeOS was originally introduced
for PreSigninPolicyFetcher with the longer term goal to be used from
UserCloudPolicyStoreChromeOS too.

BUG= 742302 
TEST=unit_tests --gtest_filter=UserCloudPolicyStoreChromeOSTest*

Change-Id: I4e386392e258b359b6632f17b97852f960f0781f
Reviewed-on: https://chromium-review.googlesource.com/581107
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489912}
[modify] https://crrev.com/221fd61a7840570e74eb9e8a71c48b6bf8000142/chrome/browser/chromeos/policy/user_cloud_policy_store_chromeos.cc
[modify] https://crrev.com/221fd61a7840570e74eb9e8a71c48b6bf8000142/chrome/browser/chromeos/policy/user_cloud_policy_store_chromeos.h

Regression testing should be enough here, this is fine if user policy is not broken.