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This removes DictionaryValue from the fake Manager, Device, and IPConfig
classes.

Bug: 1137487
Change-Id: I823c7cb6b6fd3620e750931dc9ac983365884b83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2465777Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818489}