GitLab

This moves DefaultWebClientWorkerCallback out of the constructor for
DefaultWebClientWorker and changes it to be a parameter for the
`Start(CheckIs|SetAs)Default` methods. This allows it to be a
base::OnceCallback instead of a base::RepeatingCallback.

Bug: 1106803
Change-Id: I47887ce0ca1db3b469fd1edf86f4b824c45685eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315084Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Will Cassella <cassew@google.com>
Cr-Commit-Position: refs/heads/master@{#791335}