jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/ui/android/infobars/infobar_container_android.cc

 // Copyright 2013 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/ui/android/infobars/infobar_container_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/infobars/infobar_service.h"
@@ skipping 64 matching lines @@
 
 void InfoBarContainerAndroid::PlatformSpecificRemoveInfoBar(
     infobars::InfoBar* infobar) {
   InfoBarAndroid* android_infobar = static_cast<InfoBarAndroid*>(infobar);
   android_infobar->CloseJavaInfoBar();
 }
 
 
 // Native JNI methods ---------------------------------------------------------
 
-static jlong Init(JNIEnv* env, jobject obj) {
+static jlong Init(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   InfoBarContainerAndroid* infobar_container =
       new InfoBarContainerAndroid(env, obj);
   return reinterpret_cast<intptr_t>(infobar_container);
 }
 
 bool RegisterInfoBarContainer(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }