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As part of abuse mitigation, we'll no longer perform inline app
installs overlaid on top of chrome.

This change simplifies the app banner machinery greatly as we're now
just intenting out to Play and no longer need support for dynamism in
the UI.

BUG=904566

Change-Id: I1ca74b1d8602f5e1911c1e75ec62e5a81e776beb
Reviewed-on: https://chromium-review.googlesource.com/c/1338337
Commit-Queue: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609729}