jni: Pass method parameters as JavaParamRef in content.

content/browser/android/background_sync_network_observer_android.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/background_sync_network_observer_android.h"
 
 #include "base/android/context_utils.h"
 #include "jni/BackgroundSyncNetworkObserver_jni.h"
 
 namespace content {
@@ skipping 33 matching lines @@
 BackgroundSyncNetworkObserverAndroid::Observer::~Observer() {
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_BackgroundSyncNetworkObserver_removeObserver(
       env, j_observer_.obj(), reinterpret_cast<jlong>(this));
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   j_observer_.Release();
 }
 
 void BackgroundSyncNetworkObserverAndroid::Observer::
     NotifyConnectionTypeChanged(JNIEnv* env,
-                                jobject jcaller,
+                                const JavaParamRef<jobject>& jcaller,
                                 jint new_connection_type) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(callback_,
                  static_cast<net::NetworkChangeNotifier::ConnectionType>(
                      new_connection_type)));
 }
 
 BackgroundSyncNetworkObserverAndroid::Observer::Observer(
@@ skipping 13 matching lines @@
 
   observer_ = Observer::Create(
       base::Bind(&BackgroundSyncNetworkObserverAndroid::OnNetworkChanged,
                  weak_ptr_factory_.GetWeakPtr()));
 }
 
 BackgroundSyncNetworkObserverAndroid::~BackgroundSyncNetworkObserverAndroid() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 }
 }  // namespace content