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Currently, RemoteSuggestionsService sounds more general than its true
usage, which is only for ZeroSuggestProvider.

This CL makes that more clear in the class comment, as well as adding a
TODO for a structural cleanup.

Bug: NONE
Change-Id: Iac4604e62b967d27ae65218813ecfd31e32d3d30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876875Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708762}