Add TODO to remove page_load_histograms.h/.cc

Add TODO to remove page_load_histograms.h/.cc

BUG=384330
Committed: https://crrev.com/c8e3fceef1dec0b672f9c98fcf57f128b6793712
Cr-Commit-Position: refs/heads/master@{#418983}

[Bryan McQuade, 2016-09-15 17:50:31]

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

[Bryan McQuade, 2016-09-15 17:50:49]

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

[commit-bot: I haz the power, 2016-09-15 17:51:01]

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 17:51:34]

rkaplow, I committed my update to histograms.xml before noticing your request to
add a TODO. We plan to remove the entire page_load_histograms after the M55
branch point, so I've added a file-level TODO about this. PTAL, thanks!

[commit-bot: I haz the power, 2016-09-15 19:05:48]

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

[commit-bot: I haz the power, 2016-09-15 19:05:49]

Dry run: This issue passed the CQ dry run.

[rkaplow, 2016-09-15 21:13:28]

lgtm

ty!

[Bryan McQuade, 2016-09-15 21:23:04]

The CQ bit was checked by bmcquade@chromium.org

[commit-bot: I haz the power, 2016-09-15 21:23:47]

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 21:30:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-15 21:34:05]

Description was changed from

==========
Add TODO to remove page_load_histograms.h/.cc

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

to

==========
Add TODO to remove page_load_histograms.h/.cc

BUG=384330

Committed: https://crrev.com/c8e3fceef1dec0b672f9c98fcf57f128b6793712
Cr-Commit-Position: refs/heads/master@{#418983}
==========

[commit-bot: I haz the power, 2016-09-15 21:34:06]

Patchset 1 (id:??) landed as
https://crrev.com/c8e3fceef1dec0b672f9c98fcf57f128b6793712
Cr-Commit-Position: refs/heads/master@{#418983}