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The below CL introduces a bug, where ZeroSuggestProvider can create
a match with duplicate text classifications. This triggers a DCHECK
as described in the linked bug.

https://chromium-review.googlesource.com/c/chromium/src/+/1947765

This CL fixes it and adds a test.

Bug: 1030741
Change-Id: If59fbd320d720e2a7ff8d2f66d9ee92e11bb9a68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1951557
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722497}