[Sync] Deprecate old histograms

[Sync] Deprecate old histograms

This histograms are no longer being used, and can be deprecated.

BUG=none

Committed: https://crrev.com/6ad03d918c74a29f277cf5e6eaba60e460fb95ed
Cr-Commit-Position: refs/heads/master@{#400635}

[Nicolas Zea, 2016-06-16 21:47:16]

zea@chromium.org changed reviewers:
+ pavely@chromium.org

[Nicolas Zea, 2016-06-16 21:47:17]

+Pavel, PTAL

[pavely, 2016-06-16 21:50:47]

lgtm

[Nicolas Zea, 2016-06-16 22:00:18]

zea@chromium.org changed reviewers:
+ rkaplow@chromium.org

[Nicolas Zea, 2016-06-16 22:00:18]

+rkaplow for histo's

[rkaplow, 2016-06-16 22:09:38]

lgtm

[Nicolas Zea, 2016-06-16 22:12:49]

The CQ bit was checked by zea@chromium.org

[commit-bot: I haz the power, 2016-06-16 22:13:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2078663002/40001

[commit-bot: I haz the power, 2016-06-16 22:21:56]

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

[commit-bot: I haz the power, 2016-06-16 22:21:57]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Nicolas Zea, 2016-06-20 07:23:57]

The CQ bit was checked by zea@chromium.org

[Nicolas Zea, 2016-06-20 07:23:57]

The patchset sent to the CQ was uploaded after l-g-t-m from
rkaplow@chromium.org, pavely@chromium.org
Link to the patchset: https://codereview.chromium.org/2078663002/#ps60001
(title: "Leave old enum usage")

[commit-bot: I haz the power, 2016-06-20 07:24:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2078663002/60001

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

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2016-06-20 08:22:56]

Description was changed from

==========
[Sync] Deprecate old histograms

This histograms are no longer being used, and can be deprecated.

BUG=none
==========

to

==========
[Sync] Deprecate old histograms

This histograms are no longer being used, and can be deprecated.

BUG=none

Committed: https://crrev.com/6ad03d918c74a29f277cf5e6eaba60e460fb95ed
Cr-Commit-Position: refs/heads/master@{#400635}
==========

[commit-bot: I haz the power, 2016-06-20 08:22:57]

Patchset 4 (id:??) landed as
https://crrev.com/6ad03d918c74a29f277cf5e6eaba60e460fb95ed
Cr-Commit-Position: refs/heads/master@{#400635}