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Move the FakeCrosConfig class into its own .cc/.h files so that it can
be used by other tests and fuzzers.

Bug: b:148803654
Test: components_unittests --gtest_filter=ArcPropertyUtilTest.*
Change-Id: I3bddeff8d55fe741290e5c766703b574c9d8bf58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2163729Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762163}