Use newer version of arity lib to get bugfixes.

Bug 2399991, 1793578.
diff --git a/Android.mk b/Android.mk
index c2e322e..99e6f55 100644
--- a/Android.mk
+++ b/Android.mk
@@ -31,7 +31,7 @@
 ##################################################
 include $(CLEAR_VARS)
 
-LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := libarity:arity-1.3.3.jar
+LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := libarity:arity-2.0.2.jar
 include $(BUILD_MULTI_PREBUILT)
 
 # Use the folloing include to make our test apk.