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Per the plan laid out in the linked bug, we need to persist whether
the "natural decoupling" happened, i.e. this information must be kept
across browsing sessions. This CL adds a boolean sync pref for this and
exposes getter and setters for it all the way up to the Java code.

Bug: 1125622
Change-Id: Ibeea8745f45d65cf016dbe0b316bd48228f34b14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398524
Commit-Queue: Victor Vianna <victorvianna@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805706}