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Currently, if System-proxy requires credentials to authenticate to a
remote proxy, it will send a request to the Browser to fetch credentials
from the Network Service authentication cache. If the user didn't
authenticate in the Browser yet, System-proxy will receive empty
credentials.

This CL changes the flow to notify the user that System-proxy requires
credentials and allows the user to enter the credentials in a dedicated
dialogue, without needing to go through the Browser.

Bug: 1112722
Test: unittests, manually on DUT
Change-Id: I0bb1e0e2d0a644b47dd022a87664cab1bb4e5205
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2356204Reviewed-by: Andreea-Elena Costinas <acostinas@google.com>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Omar Morsi <omorsi@google.com>
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Andreea-Elena Costinas <acostinas@google.com>
Cr-Commit-Position: refs/heads/master@{#799641}