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This CL updates the icon to expand the account list in the collapsed
bottom sheet used in web sign-in flow.

Screenshot: https://crbug.com/1103328#c1
Bug: 1103328
Change-Id: I4ce657ce917cb3b3f87dde62009cf026f4c62c34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288378
Commit-Queue: Alice Wang <aliceywang@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788565}