Delete dead code from metrics prototype

Delete dead code from metrics prototype

UrlRequestMetricsAccumulator is no longer used.

BUG=629194
Committed: https://crrev.com/6ec2da77ac02ff2c1a918b2d265ec6aa4152fc66
Cr-Commit-Position: refs/heads/master@{#423224}

[mgersh, 2016-09-19 19:40:13]

mgersh@chromium.org changed reviewers:
+ xunjieli@chromium.org

[mgersh, 2016-09-19 19:40:14]

PTAL. This is follow-up from the other CL I just sent.

[xunjieli, 2016-09-20 14:44:06]

lgtm

[mgersh, 2016-10-05 18:08:57]

The CQ bit was checked by mgersh@chromium.org

[mgersh, 2016-10-05 18:08:58]

The patchset sent to the CQ was uploaded after l-g-t-m from
xunjieli@chromium.org
Link to the patchset: https://codereview.chromium.org/2354713002/#ps60001
(title: "ugh, flaky test, sorry")

[commit-bot: I haz the power, 2016-10-05 18:09:31]

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, 2016-10-05 18:23:19]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2016-10-05 18:28:13]

Description was changed from

==========
Delete dead code from metrics prototype

UrlRequestMetricsAccumulator is no longer used.

BUG=629194
==========

to

==========
Delete dead code from metrics prototype

UrlRequestMetricsAccumulator is no longer used.

BUG=629194

Committed: https://crrev.com/6ec2da77ac02ff2c1a918b2d265ec6aa4152fc66
Cr-Commit-Position: refs/heads/master@{#423224}
==========

[commit-bot: I haz the power, 2016-10-05 18:28:15]

Patchset 4 (id:??) landed as
https://crrev.com/6ec2da77ac02ff2c1a918b2d265ec6aa4152fc66
Cr-Commit-Position: refs/heads/master@{#423224}