jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/android/most_visited_sites.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/android/most_visited_sites.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 553 matching lines @@
 }
 
 void MostVisitedSites::TopSitesChanged(history::TopSites* top_sites,
                                        ChangeReason change_reason) {
   if (mv_source_ == TOP_SITES) {
     // The displayed suggestions are invalidated.
     QueryMostVisitedURLs();
   }
 }
 
-static jlong Init(JNIEnv* env, jobject obj, jobject jprofile) {
+static jlong Init(JNIEnv* env,
+                  const JavaParamRef<jobject>& obj,
+                  const JavaParamRef<jobject>& jprofile) {
   MostVisitedSites* most_visited_sites =
       new MostVisitedSites(ProfileAndroid::FromProfileAndroid(jprofile));
   return reinterpret_cast<intptr_t>(most_visited_sites);
 }