Drop histograms suffixes for the SpdyCwnd field trial.

Drop histograms suffixes for the SpdyCwnd field trial.

This CL drops recording histogram suffixes for SpdyCwnd field trial
from 2010. These are based on depracated timing information recorded in
DocumentState and have no indicated owner.

BUG=384330
R=isherman@chromium.org, tonyg@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=281748

[ppi, 2014-07-07 12:05:43]

Tony, Ilya - please take a look.

Tony, can you think of anyone we should check with before killing this? It was
originally introduced by Mike Belshe.

[tonyg, 2014-07-07 14:43:45]

lgtm

Will would probably care most about this. If it is still useful, we should just
update it to the PT_ version.

[Ilya Sherman, 2014-07-07 23:11:56]

+Alexei: Does <obsolete> interact sensibly with <histogram_suffixes>?

No need to block this CL on answering that question though -- we can always come
back and clean up the histograms.xml file more later, if need be.  LGTM.  Thanks
for the cleanup!

[willchan no longer on Chromium, 2014-07-07 23:16:53]

We do like to look at the historical data here. Can we keep these around?


On Mon, Jul 7, 2014 at 4:11 PM, <isherman@chromium.org> wrote:

> +Alexei: Does <obsolete> interact sensibly with <histogram_suffixes>?
>
> No need to block this CL on answering that question though -- we can
> always come
> back and clean up the histograms.xml file more later, if need be.  LGTM.
>  Thanks
> for the cleanup!
>
> https://codereview.chromium.org/375503005/
>

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[Ilya Sherman, 2014-07-07 23:18:26]

On 2014/07/07 23:16:53, willchan wrote:
> We do like to look at the historical data here. Can we keep these around?

Marking a histogram as <obsolete> preserves historical data -- you just have to
tick the "Show Obsolete Histogram names" checkbox on the dashboard.  However, if
the histograms are unowned, then they will soon stop showing up on the
dashboard.  Will, was that you volunteering to own these histograms for
historical data purposes? :)

[willchan no longer on Chromium, 2014-07-07 23:23:33]

http://37.media.tumblr.com/tumblr_m9tytmeVMP1r1mr1po1_500.gif

[ppi, 2014-07-08 14:25:23]

Thanks! I added Will as the owner of the suffix.

There's already a few histogram_suffixes with <owner> and/or <obsolete> tags, I
assume we can tentatively hope this won't make things explode :).

[ppi, 2014-07-08 14:25:42]

The CQ bit was checked by ppi@chromium.org

[commit-bot: I haz the power, 2014-07-08 14:27:06]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ppi@chromium.org/375503005/40001

[ppi, 2014-07-08 14:40:38]

Committed patchset #3 manually as r281748 (presubmit successful).