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This change updates the guidance on top of values.h to prefer
base::flat_map<std::string, base::Value> over base::DictionaryValue.

Bug: 646113
Change-Id: Ib02ad787068b3f89ae56ea13c4044338eb703437
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2509576Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825281}