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This CL closes the sharesheet once an app is launched.

Bug: 1097623
Change-Id: I72ab0f8ff39569a4fd14a1f3f3efd1df46af7f0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2338154Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795725}