JNITest class is no longer actively used. This patch removes the class (java and jni) files. JNI interfaces and calls are extensively tested in the art unit tests (art/tests) and in cts (see CtsJniTestCases). Change-Id: I62f7c72deb5d206fa3f545ae39a9cb9011110d0a Signed-off-by: Ashok Bhat <ashok.bhat@arm.com>