Cleanup headers.

Change-Id: Ied1bedb8ba5fae590987ea23bed32f4db1a60d77
diff --git a/native/jni/jni_common.cpp b/native/jni/jni_common.cpp
index 105a4dc..d45f97a 100644
--- a/native/jni/jni_common.cpp
+++ b/native/jni/jni_common.cpp
@@ -16,6 +16,8 @@
 
 #define LOG_TAG "LatinIME: jni"
 
+#include <cassert>
+
 #include "com_android_inputmethod_keyboard_ProximityInfo.h"
 #include "com_android_inputmethod_latin_BinaryDictionary.h"
 #include "com_android_inputmethod_latin_NativeUtils.h"
@@ -23,8 +25,6 @@
 #include "jni.h"
 #include "jni_common.h"
 
-#include <cassert>
-
 using namespace latinime;
 
 /*