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and shares more code with it than BubbleDelegateView.

The idea is to eventually replace BubbleDelegateView. I'd just have
modified BubbleDelegateView in place, but it requires updates to many
bubbles, so the two classes coexist for now.

This CL also removes redundant code in DialogClientView for laying out
the footnote view. I verified this doesn't affect the one place that
was using the code (CardUnmaskPromptViews).

SessionCrashedBubbleView is the only bubble using the new parent class
so far. It got a bit simpler because it didn't have to reimplement the
button strip.

BUG=585312

Review URL: https://codereview.chromium.org/1717453003

Cr-Commit-Position: refs/heads/master@{#378545}