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This is a reland of a9d56928

Original change's description:
> [omnibox] Rename the ZeroSuggestProvider::ResultType values
> 
> This CL renames the ZeroSuggestProvider::ResultType values to be
> more descriptive, and adds more commentary.
> 
> They used to imply that we asked the default search provider for
> zero-suggestions, which was sometimes misleading, since that's not
> always true.
> 
> Bug: 963173
> Change-Id: I85a55cb57749441d2adfdb53642247fd055b7d9a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1631903
> Commit-Queue: Tommy Li <tommycli@chromium.org>
> Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#665330}

Bug: 963173
Change-Id: I206a4fd36189e2400bfd754ac4f0fba4ab076075
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1640160
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666125}