Remove unused code related to method entry / exit events

This Cl:
- Drops this_object and dex_pc arguments for MethodExitEvent
  which aren't used in any of the listeners.
- Removes the code to maintain dex_pcs_ which were earlier used
  by MethodEnteredEvent but are no longer used.

Test: test/tes.py
Change-Id: I0345598897004b7b6b9f26bd8940c88b5bb798f7
12 files changed