jni_generator: Pass object parameters as JavaParamRef.

content/browser/android/web_contents_observer_proxy.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 "content/browser/android/web_contents_observer_proxy.h"
 
 #include <string>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ skipping 18 matching lines @@
                                                    jobject obj,
                                                    WebContents* web_contents)
     : WebContentsObserver(web_contents) {
   DCHECK(obj);
   java_observer_.Reset(env, obj);
 }
 
 WebContentsObserverProxy::~WebContentsObserverProxy() {
 }
 
-jlong Init(JNIEnv* env, jobject obj, jobject java_web_contents) {
+jlong Init(JNIEnv* env,
+           const JavaParamRef<jobject>& obj,
+           const JavaParamRef<jobject>& java_web_contents) {
   WebContents* web_contents =
       WebContents::FromJavaWebContents(java_web_contents);
   CHECK(web_contents);
 
   WebContentsObserverProxy* native_observer =
       new WebContentsObserverProxy(env, obj, web_contents);
   return reinterpret_cast<intptr_t>(native_observer);
 }
 
 void WebContentsObserverProxy::Destroy(JNIEnv* env, jobject obj) {
@@ skipping 245 matching lines @@
   ScopedJavaLocalRef<jobject> obj(java_observer_);
 
   Java_WebContentsObserverProxy_mediaSessionStateChanged(
       env, obj.obj(), is_controllable, is_suspended);
 }
 
 bool RegisterWebContentsObserverProxy(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 }  // namespace content