Remove ContextualDictionary.haveContentsChanged().

Change-Id: I7023ba4d9515dcad90e0a226f70936550c5241f4
diff --git a/java/src/com/android/inputmethod/latin/personalization/ContextualDictionary.java b/java/src/com/android/inputmethod/latin/personalization/ContextualDictionary.java
index 7be6c4d..96f03f9 100644
--- a/java/src/com/android/inputmethod/latin/personalization/ContextualDictionary.java
+++ b/java/src/com/android/inputmethod/latin/personalization/ContextualDictionary.java
@@ -50,9 +50,4 @@
     @Override
     protected void loadInitialContentsLocked() {
     }
-
-    @Override
-    protected boolean haveContentsChanged() {
-        return false;
-    }
-}
\ No newline at end of file
+}