Cleanup headers.

Change-Id: Ied1bedb8ba5fae590987ea23bed32f4db1a60d77
diff --git a/native/jni/src/proximity_info.h b/native/jni/src/proximity_info.h
index abd07dd..6c5c6bf 100644
--- a/native/jni/src/proximity_info.h
+++ b/native/jni/src/proximity_info.h
@@ -28,7 +28,7 @@
 
 class ProximityInfo {
  public:
-    ProximityInfo(const std::string localeStr, const int maxProximityCharsSize,
+    ProximityInfo(const char *localeCStr, const int maxProximityCharsSize,
             const int keyboardWidth, const int keyboardHeight, const int gridWidth,
             const int gridHeight, const int mostCommonkeyWidth,
             const int32_t *proximityCharsArray, const int keyCount, const int32_t *keyXCoordinates,