jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/android/web_contents_factory.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/android/web_contents_factory.h"
 
 #include "base/android/jni_android.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "content/public/browser/android/content_view_core.h"
 #include "content/public/browser/web_contents.h"
 #include "jni/WebContentsFactory_jni.h"
 
 static ScopedJavaLocalRef<jobject> CreateWebContents(
     JNIEnv* env,
-    jclass clazz,
+    const JavaParamRef<jclass>& clazz,
     jboolean incognito,
     jboolean initially_hidden) {
   Profile* profile = g_browser_process->profile_manager()->GetLastUsedProfile();
   if (incognito)
     profile = profile->GetOffTheRecordProfile();
 
   content::WebContents::CreateParams params(profile);
   params.initially_hidden = static_cast<bool>(initially_hidden);
   return content::WebContents::Create(params)->GetJavaWebContents();
 }
 
 bool RegisterWebContentsFactory(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }