jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/android/bottombar/contextualsearch/contextual_search_panel.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/bottombar/contextualsearch/contextual_search_panel.h"
 
 #include <set>
 
 #include "base/android/jni_string.h"
 #include "base/callback.h"
@@ skipping 123 matching lines @@
   navigation_interception::InterceptNavigationDelegate::Associate(
       web_contents,
       make_scoped_ptr(new navigation_interception::InterceptNavigationDelegate(
           env, delegate)));
 }
 
 bool RegisterContextualSearchPanel(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
-jlong Init(JNIEnv* env, jobject obj) {
+jlong Init(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   ContextualSearchPanel* manager = new ContextualSearchPanel(env, obj);
   return reinterpret_cast<intptr_t>(manager);
 }