Provide NetworkChangeNotifierAndroid with the actual initial connection type.

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_
 
 #include "base/android/jni_android.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 43 matching lines @@
 
   static bool Register(JNIEnv* env);
 
  private:
   friend class NetworkChangeNotifierAndroidTest;
   friend class NetworkChangeNotifierFactoryAndroid;
 
   explicit NetworkChangeNotifierAndroid(
       NetworkChangeNotifierDelegateAndroid* delegate);
 
-  void SetConnectionType(ConnectionType new_connection_type);
+  // Returns the previous connection type.
+  ConnectionType SetConnectionType(ConnectionType new_connection_type);
 
   static NetworkChangeCalculatorParams NetworkChangeCalculatorParamsAndroid();
 
   NetworkChangeNotifierDelegateAndroid* const delegate_;
   mutable base::Lock connection_type_lock_;  // Protects the state below.
   ConnectionType connection_type_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierAndroid);
 };
 
 }  // namespace net
 
 #endif  // NET_ANDROID_NETWORK_CHANGE_NOTIFIER_ANDROID_H_