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After this change, the offer-dialog should be properly shown
if a user clicks the continue button in the migration bubble.

1) Made changes related to Autofill Client and wires things up.
2) Changed method names of showing
local card migration bubble from ShowLocalCardMigrationMainPrompt
to ShowLocalCardMigrationDialog.

The flow will be enabled only on desktops for now.

Bug: 852904
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Id5ee55156eb1e8615e955716836cfecd677ff456
Reviewed-on: https://chromium-review.googlesource.com/1173551Reviewed-by: Roger McFarlane <rogerm@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Commit-Queue: Siyu An <siyua@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583837}