Just use jniThrowException instead. Note that it would be trivial to throw
seemingly more appropriate exceptions (NullPointerException and
OutOfMemoryException in particular), but I'm only attempting to preserve
existing behavior here.
I also found shadowing bugs in some of the special-case functions, which
would previously always have leaked memory.
This also moves an accidental change to a generated file (ActivityThread ->
AppGlobals) into the generator, so it won't be overwritten in future.
Change-Id: Iab570310b568cb406c60dd0e2b8211f8a36ae590
