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We're consolidating exact & fuzzy string match to be both supported by
the search service. In this cl, we add case-insensitive exact match to
TokenizedStringMatch and remove it from app_search_provider. Note, fuzzy
string match already performs case-insensitive exact match internally.

Bug: 1018613
Change-Id: Ia7d17352e3b263ab09fac1e590748a08d7b16eb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089534Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Jia Meng <jiameng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748068}