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Instead, have HUDDisplayView::Toggle explicitly create and configure
a WidgetDelegate.

This change also adds callbacks for widget initialization steps to
WidgetDelegate.

Bug: 1075649
Change-Id: Ia48270e7d7431abbfdf0c6d58988d4846a1ed8c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511409Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823588}