verity: break libbase dependency

This removes the need for libbase for logging or special
types like scoped_ptr.

Now only gtest and gmock are required in order to run the unittests.

TEST=FEATURES=test emerge-(x86-alex|amd64-generic) verity
BUG=chromium-os:26649

Change-Id: I75643c5bdfe33b57afd0e3cfca7c49b7df6c5408
Reviewed-on: https://gerrit.chromium.org/gerrit/16411
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
Commit-Ready: Will Drewry <wad@chromium.org>
Tested-by: Will Drewry <wad@chromium.org>
4 files changed