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This enables the fetching of CRLSets on Chrome for Android. While Android
is not yet using the CertVerifierBuiltin, which enables CRLSets during
path building, it does support CRLSets for known MITM detection and
disclosure.

This ports the existing CRLSet tests (which hang off SSLUITest but are
really browser tests) into platform-agnostic browser_tests, running on
either android_browsertests or browsertests, respectively.

Bug: 1025424
Change-Id: I89b066dfd539b287f35a20bea54d5cb5cb739501
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930051Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Commit-Queue: Ryan Sleevi <rsleevi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720643}