Revert of [Android WebView] Implement support for Network Information API and enable it.

android_webview/browser/net/aw_network_change_notifier.h

-// Copyright 2016 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 ANDROID_WEBVIEW_BROWSER_NET_AW_NETWORK_CHANGE_NOTIFIER_H_
-#define ANDROID_WEBVIEW_BROWSER_NET_AW_NETWORK_CHANGE_NOTIFIER_H_
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "net/android/network_change_notifier_delegate_android.h"
-#include "net/base/network_change_notifier.h"
-
-namespace android_webview {
-
-// AwNetworkChangeNotifier is similar to NetworkChangeNotifierAndroid except
-// it only propagates max-bandwidth changes in order to make the Network
-// Information API work in blink.
-//
-// This somewhat reduced functionality is necessary because of the way
-// NetworkChangeNotifier is enabled in WebView. It is enabled only when there
-// are living WebView instances (instead of using ApplicationStatus) hence the
-// existing Chrome for Android implementation is not applicable as is
-// (see crbug.com/529434).
-class AwNetworkChangeNotifier
-    : public net::NetworkChangeNotifier,
-      public net::NetworkChangeNotifierDelegateAndroid::Observer {
- public:
-  ~AwNetworkChangeNotifier() override;
-
-  // NetworkChangeNotifier:
-  ConnectionType GetCurrentConnectionType() const override;
-  // Requires ACCESS_WIFI_STATE permission in order to provide precise WiFi link
-  // speed.
-  void GetCurrentMaxBandwidthAndConnectionType(
-      double* max_bandwidth_mbps,
-      ConnectionType* connection_type) const override;
-  bool AreNetworkHandlesCurrentlySupported() const override;
-  void GetCurrentConnectedNetworks(NetworkList* network_list) const override;
-  ConnectionType GetCurrentNetworkConnectionType(
-      NetworkHandle network) const override;
-  NetworkHandle GetCurrentDefaultNetwork() const override;
-
-  // NetworkChangeNotifierDelegateAndroid::Observer:
-  void OnConnectionTypeChanged() override;
-  void OnMaxBandwidthChanged(double max_bandwidth_mbps,
-                             ConnectionType type) override;
-  void OnNetworkConnected(NetworkHandle network) override;
-  void OnNetworkSoonToDisconnect(NetworkHandle network) override;
-  void OnNetworkDisconnected(NetworkHandle network) override;
-  void OnNetworkMadeDefault(NetworkHandle network) override;
-
- private:
-  friend class AwNetworkChangeNotifierFactory;
-
-  AwNetworkChangeNotifier(net::NetworkChangeNotifierDelegateAndroid* delegate);
-
-  static NetworkChangeCalculatorParams DefaultNetworkChangeCalculatorParams();
-
-  net::NetworkChangeNotifierDelegateAndroid* const delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(AwNetworkChangeNotifier);
-};
-
-}  // namespace android_webview
-
-#endif  // ANDROID_WEBVIEW_BROWSER_NET_AW_NETWORK_CHANGE_NOTIFIER_H_