jni_generator: Pass object parameters as JavaParamRef.

chromecast/base/chromecast_config_android.cc

 // Copyright 2014 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 "chromecast/base/chromecast_config_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/lazy_instance.h"
 #include "jni/ChromecastConfigAndroid_jni.h"
 
@@ skipping 29 matching lines @@
       env, base::android::GetApplicationContext());
 }
 
 // Registers a handler to be notified when SendUsageStats is changed.
 void ChromecastConfigAndroid::SetSendUsageStatsChangedCallback(
     const base::Callback<void(bool)>& callback) {
   send_usage_stats_changed_callback_ = callback;
 }
 
 // Called from Java.
-void SetSendUsageStatsEnabled(JNIEnv* env, jclass caller, jboolean enabled) {
+void SetSendUsageStatsEnabled(JNIEnv* env,
+                              const JavaParamRef<jclass>& caller,
+                              jboolean enabled) {
   ChromecastConfigAndroid::GetInstance()->
       send_usage_stats_changed_callback().Run(enabled);
 }
 
 }  // namespace android
 }  // namespace chromecast