Abstract methods aren't implementations.

We should only be checking the visibility of actual implementations
of interface methods. Intervening abstract methods are allowed to
be non-public.

Bug: https://code.google.com/p/android/issues/detail?id=42991
Change-Id: I510d0cc6c1f89d161d4ebad7ef058c03fa09e9b0
Disable DalvikVM GC logcat spam

Dalvik logs everytime a garbage collection is run. Disabled to remove
clutter from logcat. Can be renabled by #defining DEBUG.

Change-Id: I57a461857f8d0ecbf223f3c18187f62095adb5b4