Remove metrics for XMLHttpRequest.send(ArrayBuffer).

Remove metrics for XMLHttpRequest.send(ArrayBuffer).

Using an ArrayBuffer as the argument to XMLHttpRequest.send() is no
longer deprecated in the latest WHATWG spec, according to
https://www.w3.org/Bugs/Public/show_bug.cgi?id=26153#c1

This change removes the metrics used by the deprecation process. The
deprecation warnings will be removed in the Blink-side CL below.
https://codereview.chromium.org/373023002/

BUG=237493
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=281956

[pwnall-personal, 2014-07-08 10:28:05]

Can you please take a look?

[Ilya Sherman, 2014-07-08 23:04:19]

Please instead mark the histogram as <obsolete> (and leave the enum in place).

[pwnall-personal, 2014-07-08 23:26:10]

On 2014/07/08 23:04:19, Ilya Sherman wrote:
> Please instead mark the histogram as <obsolete> (and leave the enum in place).

Thank you for your guidance!

Can you please take another look?

[Ilya Sherman, 2014-07-08 23:32:08]

LGTM, thanks.

[Ilya Sherman, 2014-07-08 23:32:19]

The CQ bit was checked by isherman@chromium.org

[commit-bot: I haz the power, 2014-07-08 23:34:39]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/costan@gmail.com/372223002/40001

[pwnall-personal, 2014-07-09 00:12:27]

On 2014/07/08 23:32:08, Ilya Sherman wrote:
> LGTM, thanks.

Thank *you* for the quick turnaround!

[tyoshino (SeeGerritForStatus), 2014-07-09 04:30:22]

lgtm. thanks

[commit-bot: I haz the power, 2014-07-09 05:33:47]

Change committed as 281956