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Implement a new upgradeScheme action type for DNR rules. These rules
are evaluated along with redirect rules as they are matched based on
their specified priority.

When an http or ftp request matches with an upgradeScheme rule, the
request's scheme is changed to https.

Bug: 974388
Change-Id: I0d9524e1c7d405a413868626da99e805c26ac601
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674748
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678502}