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This CL passes a local AppBannerControllerPtr variable into the callback
sent through Mojo. This keeps the Mojo connection alive and removes the
need to store an AppBannerControllerPtr member.

BUG=None

Change-Id: Id67ba09ee438f9b455a43d4c2b89b6f8f75b27a8
Reviewed-on: https://chromium-review.googlesource.com/828240Reviewed-by: Ben Wells <benwells@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524316}