Fix issue #27532364: Security Vulnerability in IIntentSender.send

We need to make IIntentSender oneway...  but when the system is
calling that for itself, it needs to be able to return a result code.

Solution: instead of directly calling the interface, we have a new
IPC through the activity manager.  If the thing being used is the
activity manager impl, it can do the synchronous send and return
the result directly in place.  If not, you only get asynchronous
sending and thus never a failure result back (too bad for you!).

Change-Id: I4096e5b00063e8dba66230585a2dfe67e35e8092