Revert of git cl try: don't skip presubmit builders, but set dry_run property. (patchset #1 id:1 of https://codereview.chromium.org/1926663002/ )

Reason for revert:
Schedules fine, but property not set: https://build.chromium.org/p/tryserver.v8/builders/v8_presubmit/builds/14295/

reverting first, then investigating.

Original issue's description:
> git cl try: don't skip presubmit builders, but set dry_run property.
> 
> R=machenbach@chromium.org,sergiyb@chromium.org
> BUG=601128,594127,591030
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=300265

TBR=machenbach@chromium.org,sergiyb@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=601128,594127,591030

Review-Url: https://codereview.chromium.org/1929483004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300274 0039d316-1c4b-4281-b951-d872f2087c98