Disable Android backup and restore

Disable Android backup and restore

This is in preparation for re-implementing it using key/value backup.
We however want to disable Auto-backup (and all backups) in M55, since
the Auto-backups will never be used, and we are unsure whether restoring
key/value backups will work correctly in the presence of older
Auto-backups.

BUG=661188
Review-Url: https://codereview.chromium.org/2470823002
Cr-Commit-Position: refs/heads/master@{#429043}
(cherry picked from commit 9cd30398e5107e2163ec51595f18fe9290c50e00)

Committed: https://chromium.googlesource.com/chromium/src/+/2a0cb7a2166ee5400a8979b97ebe58080a98ee7e

[aberent, 2016-11-02 09:14:27]

Description was changed from

==========
Disable Android backup and restore

This is in preparation for re-implementing it using key/value backup.
We however want to disable Auto-backup (and all backups) in M55, since
the Auto-backups will never be used, and we are unsure whether restoring
key/value backups will work correctly in the presence of older
Auto-backups.

BUG=661188

Review-Url: https://codereview.chromium.org/2470823002
Cr-Commit-Position: refs/heads/master@{#429043}
(cherry picked from commit 9cd30398e5107e2163ec51595f18fe9290c50e00)
==========

to

==========
Disable Android backup and restore

This is in preparation for re-implementing it using key/value backup.
We however want to disable Auto-backup (and all backups) in M55, since
the Auto-backups will never be used, and we are unsure whether restoring
key/value backups will work correctly in the presence of older
Auto-backups.

BUG=661188

Review-Url: https://codereview.chromium.org/2470823002
Cr-Commit-Position: refs/heads/master@{#429043}
(cherry picked from commit 9cd30398e5107e2163ec51595f18fe9290c50e00)

Committed:
https://chromium.googlesource.com/chromium/src/+/2a0cb7a2166ee5400a8979b97ebe...
==========

[aberent, 2016-11-02 09:14:29]

Committed patchset #1 (id:1) manually as
2a0cb7a2166ee5400a8979b97ebe58080a98ee7e.