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Instead, have the ExtensionDialog or ExtensionPopup create this and
ensure it's properly owned by the Views hierarchy.

Bug: 1044687
Change-Id: I988473f274a0b0f7434ba85e4874932e8cb45cc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2207803
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770631}