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Change the layout of the account selection dialog in response to
feedback from UI. See https://screenshot.googleplex.com/d7L6RQC2kEi for
the source of the padding numbers. Also, based on UI feedback, remove
the placeholder avatar icons since we do not currently have plans to
show any non-placeholder icons.

Change-Id: I36f58d4db2a0036a4fb6c38aa11036b6f945b014
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1617098
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Nina Satragno <nsatragno@chromium.org>
Auto-Submit: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661069}