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This CL replaces the deprecated SetSystemTrafficCredentials dbus method
with SetAuthenticationDetails wich allows setting additional information
like kerberos availability.

BUG=chromium:1042641
TEST=updated unit tests

Change-Id: I3267d473a1a4350c07b004480d27d7c4e78fdad4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2199259
Commit-Queue: Andreea-Elena Costinas <acostinas@google.com>
Reviewed-by: Omar Morsi <omorsi@google.com>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774661}