Roll tools/swarming_client/ to 6b1084e27ed2fff08777d89e681f2b897dc3d774.

$ git log 37bcce2f5..6b1084e27 --date=short --format='%ad %ae %s' | sed 's/@chromium\.org//'
2014-09-30 maruel Add 'files', which will remove 'isolate_dependency_*'.
2014-09-30 maruel Remove isolate.py rewrite; this permits deleting a fair amount of code.

R=vadimsh@chromium.org
BUG=swarming:148

Review URL: https://codereview.chromium.org/619703003

Cr-Commit-Position: refs/heads/master@{#297529}

DEPS

@@ -47,7 +47,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.
-  'swarming_revision': '37bcce2f5ea8852f339d08857a68d287e79984e3',
+  'swarming_revision': '6b1084e27ed2fff08777d89e681f2b897dc3d774',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.