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Cleanup ruleset manage unittests by removing the need to use net::URLRequest.
Also, make WebRequestInfo movable.

BUG=696822

Change-Id: I0a0d93406b67ff1a9338b470ef68b03062ae22fd
Reviewed-on: https://chromium-review.googlesource.com/1235331
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593009}