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This CL prevents redundant copies of URLPatternSet at certain locations by
taking a const reference.

BUG=None

Change-Id: Ib44686f30e10bd03a4e05b925cf4f1664b30bd34
Reviewed-on: https://chromium-review.googlesource.com/890044Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532170}