Revert of Add tryserver.infra to Rietveld.

Revert of Add tryserver.infra to Rietveld. (patchset #1 id:1 of https://codereview.chromium.org/1283133004/ )

Reason for revert:
Because we don't have and can't easily have TryJobRietveld inside our master definition. So, let's not confuse people - scheduling from Rietveld won't work.

See http://crbug.com/403494#42 for more.

Original issue's description:
> Add tryserver.infra to Rietveld.
> 
> BUG=403494
> 
> Committed: https://chromium.googlesource.com/infra/infra/+/1f556d3a26310188ebd8e4b36282b0970e617de9

TBR=jrobbins@chromium.org,akuegel@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=403494
Committed: https://chromium.googlesource.com/infra/infra/+/8ee5e0d08274d7862f49403b4f80c43592c013d9

[tandrii(chromium), 2015-08-18 16:08:12]

Created Revert of Add tryserver.infra to Rietveld.

[commit-bot: I haz the power, 2015-08-18 16:08:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1294023007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1294023007/1

[commit-bot: I haz the power, 2015-08-18 16:08:29]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/infra/infra/+/8ee5e0d08274d7862f49403b4f80c...

[Jason Robbins -- corp, 2015-08-18 16:48:34]

jrobbins@google.com changed reviewers:
+ jrobbins@google.com

[Jason Robbins -- corp, 2015-08-18 16:48:34]

lgtm

[Jason Robbins -- corp, 2015-08-18 16:56:16]

On 2015/08/18 at 16:48:34, Jason Robbins -- corp wrote:
> lgtm

This change is live now.

[tandrii(chromium), 2015-12-02 20:03:46]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1496673002/ by tandrii@chromium.org.

The reason for reverting is: and now that Rietveld schedules through
buildbucket, this will work..