Configure Data Reduction Proxy bypass rules in one call

This change replaces multiple calls to the AddHostPatternToBypass()
function to build a list that will eventually be turned into a string
and then reparsed into a list with a single call to a new function
SetBypassRules(). This is good enough because the proxy bypass rules do
not change after they are set.

Bug: None
Change-Id: I29afc4fa45a54fa3548a329524aff51aa53854d6
Reviewed-on: https://chromium-review.googlesource.com/752072
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513642}
4 files changed