Remove emma from test build to save space.

BUG 2053298
diff --git a/Android.mk b/Android.mk
index a8df511..7112f66 100644
--- a/Android.mk
+++ b/Android.mk
@@ -7,8 +7,6 @@
 
 LOCAL_MODULE := emma
 
-LOCAL_MODULE_TAGS := tests
-
 LOCAL_JAVA_RESOURCE_DIRS := core/res
 
 LOCAL_NO_EMMA_INSTRUMENT := true