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Replace it with a vanilla WidgetDelegate using the default contents view.

Bug: 1075649
Change-Id: Ia3beabd4bedc512452cc9430ed605d4b829c727e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461212Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816301}