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This is the first step to moving the WebStateDelegate implementation
out of BVC.  The only pure virtual function on WebStateDelegate is
OnAuthRequired(), so a no-op implementation is added here.

Bug: 986956
Change-Id: I431142cbadcfe4e7cb4a6a9ce77de4ca11d9bb3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716165Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680617}