Update requests python module

BUG=chromium:483371
TEST=TODO

Change-Id: I04ccc091367fcf08a6a5f1ca535d0d409b6365d5
Reviewed-on: https://chromium-review.googlesource.com/271152
Commit-Ready: Dan Shi <dshi@google.com>
Tested-by: Dan Shi <dshi@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
5 files changed