Update re2 URL.
Update re2 URL.

The old URL is just a redirect to the new URL, so update to the new.
This also updates the license description to pass presubmit.

BUG=chromium:476190

Review URL: https://codereview.chromium.org/1395563004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#353097}

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