Revert of WebRTC: Enable bot_update for standalone recipe.

Revert of WebRTC: Enable bot_update for standalone recipe. (patchset #5 id:820001 of https://codereview.chromium.org/472963003/)

Reason for revert:
Turns out our Mac trybots are using a too old version of Git (git/1.7.4.1) the patch step fails like this:

Applying the patch.
Failed to apply patch for codereview.settings:
While running git apply --index -3 -p1 --verbose;
  error: unknown switch `3'

Original issue's description:
> WebRTC: Enable bot_update for standalone recipe.
> 
> Depends on https://codereview.chromium.org/627493002/ being
> landed first.
> 
> BUG=webrtc:3534, 419516
> TEST=Passing build with https://codereview.chromium.org/627493002/ applied:
> scripts/tools/run_recipe.py webrtc/standalone buildername="Linux64 Debug" mastername=client.webrtc slavename=x revision='"7417"' use_mirror=True
> Also tried a trybot:
> scripts/tools/run_recipe.py webrtc/standalone buildername="linux" mastername=tryserver.webrtc slavename=x revision='"7417"' patchset=1 issue=12659005 rietveld=https://webrtc-codereview.appspot.com use_mirror=True root=src
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=292403

TBR=hinoka@chromium.org,hinoka@google.com
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:3534, 419516
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=292404

[kjellander_chromium, 2014-10-10 13:11:33]

Created Revert of WebRTC: Enable bot_update for standalone recipe.

[commit-bot: I haz the power, 2014-10-10 13:12:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/644813006/1

[commit-bot: I haz the power, 2014-10-10 13:13:36]

Committed patchset #1 (id:1) as 292404