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This cl reorders the account list shown in AccountManagementFragment and
shows the signed-in account on top with "Manage your Google account" row.

Screenshot: https://crbug.com/1131008#c5

Bug: 1131008
Change-Id: Ib9cbd8052da08dc37c2e85aaaa46060509e155d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435093Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Tanmoy Mollik <triploblastic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812743}