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This CL moves account picker bottom sheet MVC to signin.ui target.

Bug: 1149857
Change-Id: Ifc32d7d39b69bb052ad3b4bddbe576d4cbe5a059
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2613972
Commit-Queue: Alice Wang <aliceywang@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842924}