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This change enables the OmniboxUIExperimentMaxAutocompleteMatches flag to
control ZeroPrefixSuggestions as well as other search suggestion types.

Bug: 1066904
Change-Id: I8eb0f41c0c86ecff32ad35f3a808225138e0ccb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132632
Commit-Queue: Ender <ender@google.com>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755438}