Separate unigram/bigram property from WordProperty.

Bug: 13406708

Change-Id: I48e9fccedd9dcdc1a35ffe027745b58966a83315
diff --git a/native/jni/NativeFileList.mk b/native/jni/NativeFileList.mk
index 3da9d56..1031903 100644
--- a/native/jni/NativeFileList.mk
+++ b/native/jni/NativeFileList.mk
@@ -32,7 +32,7 @@
         digraph_utils.cpp \
         error_type_utils.cpp \
         multi_bigram_map.cpp \
-        word_property.cpp) \
+        property/word_property.cpp) \
     $(addprefix suggest/core/layout/, \
         additional_proximity_chars.cpp \
         proximity_info.cpp \