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This change enforces coherency between Java and Native
AutocompleteResult in the situation where some of the suggestions
originate from the voice input.

This change solves the following issues:
- GroupSuggestionsBySearchVsURL will include the voice suggestions,
- Suggestions can be merged / deduplicated with existing entries
- Voice Suggestions will not be listed below grouped entries
  (suggestions with header),
- We are now able to properly report these suggestions to GWS,
- We should see fewer reports in Omnibox.Android.InvalidMatch as
  Java entries will now have corresponding Native matches.

Bug: 1151794
Change-Id: I575670781e744f3ac832705c830f3e0e506a83ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568850
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834980}