Moving junit out of core.jar and into core-junit.jar.

Change-Id: I38b585044aaa0f0ef5a243a33d942ab0e490f8f1
diff --git a/test-runner/Android.mk b/test-runner/Android.mk
index 962e96c..6d81b71 100644
--- a/test-runner/Android.mk
+++ b/test-runner/Android.mk
@@ -20,7 +20,7 @@
 
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 
-LOCAL_JAVA_LIBRARIES := core framework
+LOCAL_JAVA_LIBRARIES := core core-junit framework
 
 LOCAL_MODULE:= android.test.runner