Add a path parsing policy handler for the RoamingProfileLocation policy.

Add a path parsing policy handler for the RoamingProfileLocation policy.

This policy should like most other FilePath policies parse variables
in its content before storing its value in its backing pref.

BUG=726007
TEST=unit_tests

Review-Url: https://codereview.chromium.org/2912353003
Cr-Original-Commit-Position: refs/heads/master@{#476272}
Review-Url: https://codereview.chromium.org/2925643002 .
Cr-Commit-Position: refs/branch-heads/3112@{#163}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed: https://chromium.googlesource.com/chromium/src/+/16cd06ee6d187017a7813e2e8801b5b4471507b2

[pastarmovj, 2017-06-05 18:37:10]

Description was changed from

==========
Add a path parsing policy handler for the RoamingProfileLocation policy.

This policy should like most other FilePath policies parse variables
in its content before storing its value in its backing pref.

BUG=726007
TEST=unit_tests

Review-Url: https://codereview.chromium.org/2912353003
Cr-Commit-Position: refs/heads/master@{#476272}
(cherry picked from commit f281a6c87fbb09457c03cdcbf99d33ba59c3a6b0)
==========

to

==========
Add a path parsing policy handler for the RoamingProfileLocation policy.

This policy should like most other FilePath policies parse variables
in its content before storing its value in its backing pref.

BUG=726007
TEST=unit_tests

Review-Url: https://codereview.chromium.org/2912353003
Cr-Original-Commit-Position: refs/heads/master@{#476272}
Review-Url: https://codereview.chromium.org/2925643002 .
Cr-Commit-Position: refs/branch-heads/3112@{#163}
Cr-Branched-From:
b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed:
https://chromium.googlesource.com/chromium/src/+/16cd06ee6d187017a7813e2e8801...
==========

[pastarmovj, 2017-06-05 18:37:12]

Committed patchset #1 (id:1) manually as
16cd06ee6d187017a7813e2e8801b5b4471507b2.