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This adds a OmniboxAlternateMatchDescriptionSeparator feature flag. In
the default locale, it replaces the '-' separator between the match
contents and description with a '|' separator.

Bug: 955585
Change-Id: I98253872642e89727fe3a0b29c18caf77ca94a8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1580101Reviewed-by: Orin Jaworski <orinj@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653662}