Remove msw per-file testing/buildbot/OWNERS entry.

Remove msw per-file testing/buildbot/OWNERS entry.

The chromium.mojo.json file no longer exists.
It was folded into chromium.fyi.json in:
  https://codereview.chromium.org/2114453002/

BUG=619128
TEST=NONE
TBR=sky@chromium.org

Committed: https://crrev.com/14746e2fcc5eafaa5cba62ca94f6441d3e3e7d71
Cr-Commit-Position: refs/heads/master@{#403259}

[msw, 2016-06-30 18:38:18]

Hey Scott, please take a look as you have time; thanks!

[msw, 2016-06-30 18:38:21]

The CQ bit was checked by msw@chromium.org

[commit-bot: I haz the power, 2016-06-30 18:38:59]

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, 2016-06-30 19:52:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-30 19:52:21]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-06-30 19:53:51]

Description was changed from

==========
Remove msw per-file testing/buildbot/OWNERS entry.

The chromium.mojo.json file no longer exists.
It was folded into chromium.fyi.json in:
  https://codereview.chromium.org/2114453002/

BUG=619128
TEST=NONE
TBR=sky@chromium.org
==========

to

==========
Remove msw per-file testing/buildbot/OWNERS entry.

The chromium.mojo.json file no longer exists.
It was folded into chromium.fyi.json in:
  https://codereview.chromium.org/2114453002/

BUG=619128
TEST=NONE
TBR=sky@chromium.org

Committed: https://crrev.com/14746e2fcc5eafaa5cba62ca94f6441d3e3e7d71
Cr-Commit-Position: refs/heads/master@{#403259}
==========

[commit-bot: I haz the power, 2016-06-30 19:53:52]

Patchset 1 (id:??) landed as
https://crrev.com/14746e2fcc5eafaa5cba62ca94f6441d3e3e7d71
Cr-Commit-Position: refs/heads/master@{#403259}

[sky, 2016-06-30 21:24:03]

LGTM