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Our upcoming client has code in src/chromeos/components and cannot
depend on local search service that's in src/chrome. Hence we need
to move local search service to src/chromeos/components.

Some library functions used by local search service are in
src/chrome/common/string_matching. This cl moves these functions
to src/chromeos/components/string_matching. The next cl will
move local search service itself.

Bug: 1102232
Change-Id: I3d17b22b918cd3d1c55d40ef4aa6509da6b28957
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2281798
Commit-Queue: Jia Meng <jiameng@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786145}