jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/ssl/connection_security_android.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ssl/connection_security_android.h"
 
 #include "base/logging.h"
 #include "chrome/browser/ssl/connection_security.h"
 #include "content/public/browser/web_contents.h"
 #include "jni/ConnectionSecurity_jni.h"
 
 // static
 bool RegisterConnectionSecurityAndroid(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 // static
-jint GetSecurityLevelForWebContents(JNIEnv* env,
-                                    jclass jcaller,
-                                    jobject jweb_contents) {
+jint GetSecurityLevelForWebContents(
+    JNIEnv* env,
+    const JavaParamRef<jclass>& jcaller,
+    const JavaParamRef<jobject>& jweb_contents) {
   content::WebContents* web_contents =
       content::WebContents::FromJavaWebContents(jweb_contents);
   DCHECK(web_contents);
   return connection_security::GetSecurityLevelForWebContents(web_contents);
 }