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Continuation of work from crrev.com/c/1202147, fixing up how delegates
are set and persisted (using the base::NoDestructor pattern).

Bug: 865947
Change-Id: Ib8768fe71e91c5f1bad400ec047b2c941a939608
Reviewed-on: https://chromium-review.googlesource.com/1210502Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Ivan Šandrk <isandrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589940}