Roll src/tools/swarming_client/ 84537cb7a..b64f0423e (2 commits).
Roll src/tools/swarming_client/ 84537cb7a..b64f0423e (2 commits).

https://chromium.googlesource.com/external/swarming.client.git/+log/84537cb7a87e..b64f0423ee66

$ git log 84537cb7a..b64f0423e --date=short --no-merges --format='%ad %ae %s'
2015-10-20 maruel Handle throw in make_tree_deleteable() when called from rmtree().
2015-10-20 maruel Fix subprocess42 communicate() timeout support.

R=msw@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1413953004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#355138}

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