jni: Pass method parameters as JavaParamRef in content.

content/browser/time_zone_monitor_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 "content/browser/time_zone_monitor_android.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "jni/TimeZoneMonitor_jni.h"
 
 namespace content {
 
 TimeZoneMonitorAndroid::TimeZoneMonitorAndroid() : TimeZoneMonitor() {
   impl_.Reset(Java_TimeZoneMonitor_getInstance(
       base::android::AttachCurrentThread(),
       base::android::GetApplicationContext(),
       reinterpret_cast<intptr_t>(this)));
 }
 
 TimeZoneMonitorAndroid::~TimeZoneMonitorAndroid() {
   Java_TimeZoneMonitor_stop(base::android::AttachCurrentThread(), impl_.obj());
 }
 
 // static
 bool TimeZoneMonitorAndroid::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
-void TimeZoneMonitorAndroid::TimeZoneChangedFromJava(JNIEnv* env,
-                                                     jobject caller) {
+void TimeZoneMonitorAndroid::TimeZoneChangedFromJava(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& caller) {
   NotifyRenderers();
 }
 
 // static
 scoped_ptr<TimeZoneMonitor> TimeZoneMonitor::Create() {
   return scoped_ptr<TimeZoneMonitor>(new TimeZoneMonitorAndroid());
 }
 
 }  // namespace content