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This CL extracts the UI-independent logic from
AppBannerInfoBarDelegateAndroid, and moves it to a new class,
AppBannerUiDelegateAndroid. This will allow a new modal UI surface to be
introduced for banners that uses the same app installation logic.

BUG=811578

Change-Id: I0998b0086783d4c78f25c966917c40adb9638f7f
Reviewed-on: https://chromium-review.googlesource.com/915442
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537915}