jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/android/contextualsearch/contextual_search_tab_helper.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/contextualsearch/contextual_search_tab_helper.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 22 matching lines @@
 void ContextualSearchTabHelper::OnContextualSearchPrefChanged() {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jobject> jobj = weak_java_ref_.get(env);
   Java_ContextualSearchTabHelper_onContextualSearchPrefChanged(env, jobj.obj());
 }
 
 void ContextualSearchTabHelper::Destroy(JNIEnv* env, jobject obj) {
   delete this;
 }
 
-static jlong Init(JNIEnv* env, jobject obj, jobject java_profile) {
+static jlong Init(JNIEnv* env,
+                  const JavaParamRef<jobject>& obj,
+                  const JavaParamRef<jobject>& java_profile) {
   Profile* profile = ProfileAndroid::FromProfileAndroid(java_profile);
   CHECK(profile);
   ContextualSearchTabHelper* tab = new ContextualSearchTabHelper(
       env, obj, profile);
   return reinterpret_cast<intptr_t>(tab);
 }
 
 bool RegisterContextualSearchTabHelper(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }