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This change removes the deprecated SetDictionaryWithoutPathExpansion in
the //chromeos directory and replaces it with the new base::Value API.

Bug: 646113
Change-Id: Ia3be13e49959224db93a1dd67408590af780a98e
Reviewed-on: https://chromium-review.googlesource.com/776656
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517792}