Move IOThread::LoggingNetworkChangeObserver to net/base

net/base/logging_network_change_observer.h

Index: net/base/logging_network_change_observer.h
diff --git a/net/base/logging_network_change_observer.h b/net/base/logging_network_change_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..844acb3b70ec5aeff48d6da174ff6426c289d059
--- /dev/null
+++ b/net/base/logging_network_change_observer.h
@@ -0,0 +1,47 @@
+// Copyright (c) 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 NET_BASE_LOGGING_NETWORK_CHANGE_OBSERVER_H_
+#define NET_BASE_LOGGING_NETWORK_CHANGE_OBSERVER_H_
+
+#include "base/macros.h"
+#include "net/base/net_export.h"
+#include "net/base/network_change_notifier.h"
+
+namespace net {
+
+class NetLog;
+
+// A class that adds NetLog events for network change events coming from the
+// net::NetworkChangeNotifier.
+class NET_EXPORT LoggingNetworkChangeObserver
+    : public NetworkChangeNotifier::IPAddressObserver,
+      public NetworkChangeNotifier::ConnectionTypeObserver,
+      public NetworkChangeNotifier::NetworkChangeObserver {
+ public:
+  // Note: |net_log| must remain valid throughout the lifetime of this
+  // LoggingNetworkChangeObserver.
+  explicit LoggingNetworkChangeObserver(NetLog* net_log);
+  ~LoggingNetworkChangeObserver() override;
+
+ private:
+  // NetworkChangeNotifier::IPAddressObserver implementation.
+  void OnIPAddressChanged() override;
+
+  // NetworkChangeNotifier::ConnectionTypeObserver implementation.
+  void OnConnectionTypeChanged(
+      NetworkChangeNotifier::ConnectionType type) override;
+
+  // NetworkChangeNotifier::NetworkChangeObserver implementation.
+  void OnNetworkChanged(NetworkChangeNotifier::ConnectionType type) override;
+
+ private:
+  NetLog* net_log_;
+
+  DISALLOW_COPY_AND_ASSIGN(LoggingNetworkChangeObserver);
+};
+
+}  // namespace net
+
+#endif  // NET_BASE_LOGGING_NETWORK_CHANGE_OBSERVER_H_