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This CL was cloned from https://codereview.chromium.org/2965173002/.

Create a new class `ContextualSuggestionsService` to fetch experimental
contextual suggestions for the omnibox.

Bug: 692471,609084, 750985
Change-Id: Ib54be91b1c0e2cb1fcdaf9a7a43b71984e5c358c
Reviewed-on: https://chromium-review.googlesource.com/576284
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Reviewed-by: Rohit Rao (ping after 24h) <rohitrao@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491762}