Fix a JNI local reference leak in JNIMediaPlayerListener::notify.

Bug: https://code.google.com/p/android/issues/detail?id=62137
Change-Id: I776cd83a66de37fdbbe8af367bf1b26e5e0c7247
Fix NPE in ConnectivityService

Could occur when requestRouteToHostAddress is called on a network
with no associated tracker.  Code later in the method handles
this case gracefully but code introduced in JB throws an exception.

Change-Id: I6c8a0e313ecbcca120aeb5dd0802a72114749aa1