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TokenSetRatio calculates pairwise string match ratios between the
following three and returns the max as the final result.
(i). intersection string (of query & text)
(ii). query rewritten (intersection + query_diff_text)
(iii). text rewritten (intersection + text_diff_query)

If we enable partial match, then (i) and (ii) or (i) and (iii)
will return extremely high ratios (close to 1) if intersection
is non-empty. This means if there is any common word between
query and text, the result ratio will be too high.

This cl disables partial match in TokenSetRatio.

Bug: 1081584
Change-Id: If4062c367f74be62a733d6b0e3d54353bfba1365
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2206057Reviewed-by: Thanh Nguyen <thanhdng@chromium.org>
Commit-Queue: Jia Meng <jiameng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769626}