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We need to invalidate the layout, in case the Header view is changed
after the bubble has been created.

This is also aligned with SetFootnoteView().

Bug: 1115936
Change-Id: I66896d7beeda5e2996ee9c72fad0bdbf99a268a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421517
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809012}