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This also refactors OutdatedUpgradeBubbleView to use DialogModel, which
makes use of body text.

Bug: 1106422
Change-Id: Ifae91809fc6c71274ac4c0368d427e7b094d8ddc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2351061Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798829}