jni: Pass method parameters as JavaParamRef in chrome/browser/ui.

chrome/browser/ui/android/infobars/auto_signin_first_run_infobar.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 "chrome/browser/ui/android/infobars/auto_signin_first_run_infobar.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "components/password_manager/core/common/credential_manager_types.h"
@@ skipping 19 matching lines @@
       env, auto_signin_infobar_delegate->GetExplanation());
   ScopedJavaLocalRef<jstring> message_text = ConvertUTF16ToJavaString(
       env, auto_signin_infobar_delegate->GetMessageText());
 
   return Java_AutoSigninFirstRunInfoBar_show(
       env, message_text.obj(), ok_button_text.obj(), explanation_text.obj(),
       auto_signin_infobar_delegate->message_link_range().start(),
       auto_signin_infobar_delegate->message_link_range().end());
 }
 
-void AutoSigninFirstRunInfoBar::OnLinkClicked(JNIEnv* env, jobject obj) {
+void AutoSigninFirstRunInfoBar::OnLinkClicked(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj) {
   GetDelegate()->LinkClicked(NEW_FOREGROUND_TAB);
 }
 
 bool AutoSigninFirstRunInfoBar::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 scoped_ptr<infobars::InfoBar> CreateAutoSigninFirstRunInfoBar(
     scoped_ptr<AutoSigninFirstRunInfoBarDelegate> delegate) {
   return make_scoped_ptr(new AutoSigninFirstRunInfoBar(delegate.Pass()));
 }