Refactor Android's NetworckChangeNotifier.

net/android/network_change_notifier_android.h

 // Copyright (c) 2012 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.
 
 #ifndef NET_ANDROID_NETWORK_CHANGE_NOTIFIER_ANDROID_H_
 #define NET_ANDROID_NETWORK_CHANGE_NOTIFIER_ANDROID_H_
 #pragma once
 
-#include "base/android/scoped_java_ref.h"
-#include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "net/base/network_change_notifier.h"
 
 namespace net {
 namespace android {
 
+// On Android this is provided as a 'loop back' implementation, where the
+// embedder chooses how and when to update the current network connection
+// state. Embedders must push the current state down via setConnected().
+//
+// This is a singleton object and the singleton property is enforced by
+// a private constructor here and the friend NetworkChangeNotifierFactory
+// class.
 class NetworkChangeNotifier : public net::NetworkChangeNotifier {
  public:
+  // The embedder must call through to this method to notify the network
+  // stack of the current connection state.
+  void setConnected(bool network_up);
+
+ private:
   NetworkChangeNotifier();
   virtual ~NetworkChangeNotifier();
 
-  void NotifyObservers(JNIEnv* env, jobject obj);
-
-  static bool Register(JNIEnv* env);
-
- private:
-  void CreateJavaObject(JNIEnv* env);
-
   // NetworkChangeNotifier:
   virtual net::NetworkChangeNotifier::ConnectionType
       GetCurrentConnectionType() const OVERRIDE;
 
-  base::android::ScopedJavaGlobalRef<jobject> java_network_change_notifier_;
+  bool is_connected_;
+
+  friend class NetworkChangeNotifierFactory;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifier);
 };
 
 }  // namespace android
 }  // namespace net
 
 #endif  // NET_ANDROID_NETWORK_CHANGE_NOTIFIER_ANDROID_H_