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(1) Link() calls Init() unconditionally from its constructor and nowhere else.
    Inline this.
(2) No one calls MessageBoxView::SetLink() with empty |text|.  Remove the
    handling for that case and add DCHECKs.

Bug: none
Change-Id: Id5d95010d8c06340d30707db42515f4769d2cba5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1983431
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728140}