Make NQE a derived class of NetworkQualityProvider

content/public/browser/network_quality_observer_factory.h

 // Copyright (c) 2017 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 CONTENT_PUBLIC_BROWSER_NETWORK_QUALITY_OBSERVER_FACTORY_H_
 #define CONTENT_PUBLIC_BROWSER_NETWORK_QUALITY_OBSERVER_FACTORY_H_
 
 #include "base/macros.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_process_host.h"
-#include "net/nqe/network_quality_estimator.h"
+#include "net/nqe/rtt_throughput_estimates_observer.h"
+
+namespace net {
+class NetworkQualityEstimator;
+}
 
 namespace content {
 
 // Creates network quality observer that listens for changes to the network
 // quality and manages sending updates to each RenderProcess.
-CONTENT_EXPORT std::unique_ptr<
-    net::NetworkQualityEstimator::RTTAndThroughputEstimatesObserver>
+CONTENT_EXPORT std::unique_ptr<net::RTTAndThroughputEstimatesObserver>
 CreateNetworkQualityObserver(
     net::NetworkQualityEstimator* network_quality_estimator);
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NETWORK_QUALITY_OBSERVER_FACTORY_H_