PayloadSpecs has complicated methods, which makes hard to test other dependent classes. Making it non-static allows mocking it, which makes testing other classes easier. Test: manually Test: using JUnit4 Change-Id: I818dc59c6bb0e7d131439d0d41f88d5cd9a451b4 Signed-off-by: Zhomart Mukhamejanov <zhomart@google.com>