jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/ui/android/infobars/data_reduction_proxy_infobar.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 "chrome/browser/ui/android/infobars/data_reduction_proxy_infobar.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/logging.h"
 #include "chrome/browser/android/resource_mapper.h"
@@ skipping 45 matching lines @@
 // static
 scoped_ptr<infobars::InfoBar> DataReductionProxyInfoBarDelegate::CreateInfoBar(
     infobars::InfoBarManager* infobar_manager,
     scoped_ptr<DataReductionProxyInfoBarDelegate> delegate) {
   return scoped_ptr<infobars::InfoBar>(
       new DataReductionProxyInfoBar(delegate.Pass()));
 }
 
 
 // JNI for DataReductionProxyInfoBarDelegate.
-void
-Launch(JNIEnv* env, jclass clazz, jobject jweb_contents, jstring jlink_url) {
+void Launch(JNIEnv* env,
+            const JavaParamRef<jclass>& clazz,
+            const JavaParamRef<jobject>& jweb_contents,
+            const JavaParamRef<jstring>& jlink_url) {
   DataReductionProxyInfoBar::Launch(env, clazz, jweb_contents, jlink_url);
 }