[Autofill Auth] Reset rate limiter for GDFGRP on page refresh.

On page refresh, signal that GDFGRP request can be made again,
regardless of timeout.

Bug: 949269
Change-Id: Idcf75c8125e6fd0ddd8c1ae06ccbb80385f57c65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276408


Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Jared Saul <jsaul@google.com>
Commit-Queue: Manas Verma <manasverma@google.com>
Cr-Commit-Position: refs/heads/master@{#791465}