Simplify hidden_api.h logic

Refactor GetMemberAction to return a boolean whether access to a class
member should be denied. This also moves StrictMode consumer
notification into hidden_api.cc and removes notifications for toasts.
Tests are changed accordingly.

Test: phone boots
Test: m test-art
Change-Id: I02902143de0ff91d402ba79c83f28226b1822a6f