Deprecate PLT UserTiming histograms that are no longer needed.

Deprecate PLT UserTiming histograms that are no longer needed.

We will stop logging these and other PLT.* histograms in M56.
For the time being, we're deprecating them.

BUG=384330
Committed: https://crrev.com/6c88bbfb8f8a74f97de71366c11acf5ab192c70c
Cr-Commit-Position: refs/heads/master@{#418913}

[Bryan McQuade, 2016-09-15 15:12:49]

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

[Bryan McQuade, 2016-09-15 15:13:05]

bmcquade@chromium.org changed reviewers:
+ pmeenan@chromium.org, rkaplow@chromium.org

[commit-bot: I haz the power, 2016-09-15 15:13:06]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Bryan McQuade, 2016-09-15 15:13:13]

PTAL, thanks!

[commit-bot: I haz the power, 2016-09-15 16:54:46]

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

[commit-bot: I haz the power, 2016-09-15 16:54:47]

Dry run: Try jobs failed on following builders:
  win_chromium_x64_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[Pat Meenan, 2016-09-15 17:11:33]

lgtm

[rkaplow, 2016-09-15 17:25:42]

lgtm

lg, but would you mind adding TODOs at where they are recorded so it is harder
to forget?

[Bryan McQuade, 2016-09-15 17:47:05]

The CQ bit was checked by bmcquade@chromium.org

[commit-bot: I haz the power, 2016-09-15 17:48:08]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-15 18:41:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-15 18:43:11]

Description was changed from

==========
Deprecate PLT UserTiming histograms that are no longer needed.

We will stop logging these and other PLT.* histograms in M56.
For the time being, we're deprecating them.

BUG=384330
==========

to

==========
Deprecate PLT UserTiming histograms that are no longer needed.

We will stop logging these and other PLT.* histograms in M56.
For the time being, we're deprecating them.

BUG=384330

Committed: https://crrev.com/6c88bbfb8f8a74f97de71366c11acf5ab192c70c
Cr-Commit-Position: refs/heads/master@{#418913}
==========

[commit-bot: I haz the power, 2016-09-15 18:43:12]

Patchset 1 (id:??) landed as
https://crrev.com/6c88bbfb8f8a74f97de71366c11acf5ab192c70c
Cr-Commit-Position: refs/heads/master@{#418913}