mac: Remove the unused UMA histogram OSX.CatSixtyFour.

mac: Remove the unused UMA histogram OSX.CatSixtyFour.

The histogram was used for the 64bit transition. Is it no longer useful.

BUG=

Committed: https://crrev.com/7fce85a88b57b7b08762690ed9c763ba319f9af8
Cr-Commit-Position: refs/heads/master@{#322258}

[erikchen, 2015-03-25 18:39:46]

Patchset #1 (id:1) has been deleted

[erikchen, 2015-03-25 18:49:33]

erikchen@chromium.org changed reviewers:
+ mark@chromium.org

[erikchen, 2015-03-25 18:49:33]

mark: Please review.

[Mark Mentovai, 2015-03-25 18:51:31]

LGTM<

[erikchen, 2015-03-25 18:52:01]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2015-03-25 18:52:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1030253003/20001

[commit-bot: I haz the power, 2015-03-25 19:05:25]

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

[commit-bot: I haz the power, 2015-03-25 19:05:26]

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

[erikchen, 2015-03-25 19:07:15]

erikchen@chromium.org changed reviewers:
+ isherman@chromium.org

[erikchen, 2015-03-25 19:07:16]

isherman: Looking for an OWNER review of tools/metrics/histograms/histograms.xml

[Ilya Sherman, 2015-03-25 20:31:35]

Hooray for cleanup!

https://codereview.chromium.org/1030253003/diff/20001/tools/metrics/histogram...
File tools/metrics/histograms/histograms.xml (left):

https://codereview.chromium.org/1030253003/diff/20001/tools/metrics/histogram...
tools/metrics/histograms/histograms.xml:24163: -</histogram>
Please mark this as <obsolete instead.

[erikchen, 2015-03-25 21:11:59]

isherman: PTAL

[Ilya Sherman, 2015-03-25 21:17:56]

LGTM, thanks :)

[Ilya Sherman, 2015-03-25 21:18:00]

The CQ bit was checked by isherman@chromium.org

[Ilya Sherman, 2015-03-25 21:18:00]

The patchset sent to the CQ was uploaded after l-g-t-m from mark@chromium.org
Link to the patchset: https://codereview.chromium.org/1030253003/#ps40001
(title: "Comments from isherman.")

[commit-bot: I haz the power, 2015-03-25 21:18:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1030253003/40001

[commit-bot: I haz the power, 2015-03-25 23:15:05]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2015-03-25 23:15:59]

Patchset 2 (id:??) landed as
https://crrev.com/7fce85a88b57b7b08762690ed9c763ba319f9af8
Cr-Commit-Position: refs/heads/master@{#322258}