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Some unit tests need access to the footnote view of a dialog. This
change adds a method to DialogDelegate to get the footnote view, and
changes a test suite (BookmarkBubbleTest) to use it.

Bug: 1011446
Change-Id: Ica62c0512a36b6f58c26b3ad8e9694e6a7c2cbad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900363
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713483}