jni_generator: Pass object parameters as JavaParamRef.

chromecast/android/cast_metrics_helper_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 "chromecast/android/cast_metrics_helper_android.h"
 
 #include "chromecast/base/metrics/cast_metrics_helper.h"
 #include "jni/CastMetricsHelper_jni.h"
 
 namespace chromecast {
 
 // static
 bool CastMetricsHelperAndroid::RegisterJni(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
-void LogMediaPlay(JNIEnv* env, jclass clazz) {
+void LogMediaPlay(JNIEnv* env, const JavaParamRef<jclass>& clazz) {
   metrics::CastMetricsHelper::GetInstance()->LogMediaPlay();
 }
 
-void LogMediaPause(JNIEnv* env, jclass clazz) {
+void LogMediaPause(JNIEnv* env, const JavaParamRef<jclass>& clazz) {
   metrics::CastMetricsHelper::GetInstance()->LogMediaPause();
 }
 
 }  // namespace chromecast