[nobuildbot] Replace presubmit bot with swarmbucket version

BUG=skia:

Change-Id: I40d46e3a8a5c6c6fa77075c94d6bd290f764a41c
Reviewed-on: https://skia-review.googlesource.com/5512
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
1 file changed