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This CL creates a AccountReconcilorDelegate class, with two subclasses
specialized for Mirror and Dice respectively.

Bug: 777774
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I4bdb4ecee7d4f12e910a2704a09802c383bca9bb
Reviewed-on: https://chromium-review.googlesource.com/766368
Commit-Queue: David Roger <droger@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517347}