Remove a duplicated method

Change-Id: I41bd0612bf42d549d1acf0d733b689fce68aa8a1
diff --git a/native/jni/src/bigram_dictionary.cpp b/native/jni/src/bigram_dictionary.cpp
index 44dc75e..ef0434c 100644
--- a/native/jni/src/bigram_dictionary.cpp
+++ b/native/jni/src/bigram_dictionary.cpp
@@ -21,6 +21,7 @@
 #include "bigram_dictionary.h"
 #include "binary_format.h"
 #include "bloom_filter.h"
+#include "char_utils.h"
 #include "defines.h"
 #include "dictionary.h"
 
@@ -50,7 +51,7 @@
     int insertAt = 0;
     while (insertAt < MAX_RESULTS) {
         if (frequency > bigramFreq[insertAt] || (bigramFreq[insertAt] == frequency
-                && length < Dictionary::wideStrLen(
+                && length < getCodePointCount(MAX_WORD_LENGTH,
                         bigramCodePoints + insertAt * MAX_WORD_LENGTH))) {
             break;
         }