JDWP: fix possible JdwpEvent memory leak

Fixes possible memory leak when registering new JdwpEvent but the
Count modifier is invalid. This is done by using a std::unique_ptr
with a custom delete function. It also allows to easily introduce
more modifier checks in the future.

Bug: 14076832
Change-Id: I339ffb1297165ff85ab924e5e7618d336df5612b
1 file changed