MD History: Disable by default

MD History: Disable by default

We are disabling the feature for now, and will proceed with a rollout in
M54 after remaining problems are fixed.

BUG=619612
Committed: https://crrev.com/ece56c695911ac53c59f883762a42a98f3f4fa5a
Cr-Commit-Position: refs/heads/master@{#401822}

[tsergeant, 2016-06-20 00:30:07]

The CQ bit was checked by tsergeant@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-06-20 00:30:16]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2077283002/1

[commit-bot: I haz the power, 2016-06-20 01:08:51]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-06-20 01:08:52]

Dry run: This issue passed the CQ dry run.

[tsergeant, 2016-06-21 04:36:14]

Description was changed from

==========
MD History: Disable by default

A short stint on Canary has uncovered some significant performance
and functionality problems. We are disabling the feature for now,
and will proceed with a rollout in M54 after these problems are fixed.

BUG=619612
==========

to

==========
MD History: Disable by default

We are disabling the feature for now, and will proceed with a rollout in
M54 after remaining problems are fixed.

BUG=619612
==========

[tsergeant, 2016-06-22 02:51:50]

tsergeant@chromium.org changed reviewers:
+ thestig@chromium.org

[tsergeant, 2016-06-22 02:51:51]

+thestig@, PTAL

[Lei Zhang, 2016-06-22 04:34:58]

lgtm

[tsergeant, 2016-06-24 05:38:50]

The CQ bit was checked by tsergeant@chromium.org

[commit-bot: I haz the power, 2016-06-24 05:39:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2077283002/1

[commit-bot: I haz the power, 2016-06-24 05:43:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-24 05:44:52]

Description was changed from

==========
MD History: Disable by default

We are disabling the feature for now, and will proceed with a rollout in
M54 after remaining problems are fixed.

BUG=619612
==========

to

==========
MD History: Disable by default

We are disabling the feature for now, and will proceed with a rollout in
M54 after remaining problems are fixed.

BUG=619612

Committed: https://crrev.com/ece56c695911ac53c59f883762a42a98f3f4fa5a
Cr-Commit-Position: refs/heads/master@{#401822}
==========

[commit-bot: I haz the power, 2016-06-24 05:44:53]

Patchset 1 (id:??) landed as
https://crrev.com/ece56c695911ac53c59f883762a42a98f3f4fa5a
Cr-Commit-Position: refs/heads/master@{#401822}