Remove transitioned buildslaves
Remove transitioned buildslaves

BUG=skia:

Change-Id: Id63984ea634881b104918f149b5b1376d37aabd7
Reviewed-on: https://skia-review.googlesource.com/5341
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot