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Currently, ParentAccessServiceTest uses LoginPolicyTestBase to log in
as child user for tests. We should deprecate LoginPolicyTestBase in
favor of LoggedInUserMixin instead. This CL converts
ParentAccessServiceTest to replace LoginPolicyTestBase with
LoggedInUserMixin for logging in as child user for tests.

Bug: 1014663
Change-Id: Ied5b53ee8ec2f44d5dc2193f011b741217080eed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1909273Reviewed-by: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Toby Huang <tobyhuang@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#714592}
Signed-off-by: Toby Huang <tobyhuang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1914348
Cr-Commit-Position: refs/heads/master@{#715496}