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The base::Value API is redesigned to favor passing instances by
value instead of via std::unique_ptr<base::Value>. Also the sub-
classes base::DictionaryValue and base::ListValue are deprecated
in favor of just checking that the base::Value is of correct type.

Convert HostInfo & HostListFetcher to use the new API.

Bug: 646113, 925165
Change-Id: I02cfafd3817f79c1a441af60597360260fe13c2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1594583Reviewed-by: Yuwei Huang <yuweih@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656749}