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Users have the option to clear the HTTP authentication cache in the
browser. System-proxy uses the proxy credentials which a user has
entered in the browser to authenticate to a remote proxy.

This CL implements sending a |ClearUserCredentials| request to the
System-proxy service when a user clears the auth cache in the browser.

Bug: 1098216
Test: browser test
Change-Id: Ie2fb3020727005acb8fceca911e7587ce0d128b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317957
Commit-Queue: Andreea-Elena Costinas <acostinas@google.com>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Omar Morsi <omorsi@google.com>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794963}