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When the System-proxy service in CrOS sends an AuthenticationRequired
signal for a specific protection space (proxy url, scheme, realm), the
SystemProxyManager inside the Browser looks for the credentials added by
the user.

If found, it will send the credentials and protection space to
System-proxy via dbus. If no credentials are found or no user has
signed in yet, it will send the protection space with empty credentials
to signal that the request was processed.

BUG=1042642
TEST=unittest, tested on DUT

Change-Id: Id427d962d22171a41586f51d2936a73bfe8694e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2246163Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Omar Morsi <omorsi@google.com>
Commit-Queue: Andreea-Elena Costinas <acostinas@google.com>
Cr-Commit-Position: refs/heads/master@{#786355}