Roll src/tools/swarming_client/ f78187ab7..7f463e66e (5 commits)

https://chromium.googlesource.com/infra/luci/client-py.git/+log/f78187ab7712..7f463e66e1c4

$ git log f78187ab7..7f463e66e --date=short --no-merges --format='%ad %ae %s'
2018-11-16 bradhall Only allow repeated dimensions for 'caches'
2018-11-06 tikuta [client] Add --filepath-filter option to choose download files from isolate
2018-11-02 tikuta Revert "[client] Increase worker to download isolate files faster"
2018-11-01 tikuta [client] Increase worker to download isolate files faster
2018-11-01 vadimsh [isolate] Don't unexpectedly raise KeyError if the cache state file was lost.

Created with:
  roll-dep src/tools/swarming_client

Bug: 871453
Change-Id: If2148a3a89af930dcf8ec0a6a5f71684cf974c9b
Reviewed-on: https://chromium-review.googlesource.com/c/1340332
Commit-Queue: Brad Hall <bradhall@google.com>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608918}

DEPS

@@ -124,7 +124,7 @@ 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': 'f78187ab77127de42555afe0ad410bebde6ac6a5',
+  'swarming_revision': '7f463e66e1c4bb830ef3de9d046aa227d28e1b00',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.