Expose newly added policy (CleanUpStrategy)

BUG=chromium:306334
TEST=unit tests
Change-Id: Ia3fd3a24cf0ff8796d3bab57311960dea3b5e8f4
Reviewed-on: https://chromium-review.googlesource.com/174740
Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Tested-by: Denis Kuznetsov <antrim@chromium.org>
Commit-Queue: Denis Kuznetsov <antrim@chromium.org>
6 files changed