Revert of Expose RTT and throughput estimates from Cronet

components/cronet/android/cronet_url_request_context_adapter.cc

Index: components/cronet/android/cronet_url_request_context_adapter.cc
diff --git a/components/cronet/android/cronet_url_request_context_adapter.cc b/components/cronet/android/cronet_url_request_context_adapter.cc
index 7c1385058a30caab90dd0a35fff31b5cab3639f8..ffe6089a2ec9ba859339a059dc1872bd46ca25d7 100644
--- a/components/cronet/android/cronet_url_request_context_adapter.cc
+++ b/components/cronet/android/cronet_url_request_context_adapter.cc
@@ -427,7 +427,6 @@
     network_quality_estimator_->RemoveRTTObserver(this);
     network_quality_estimator_->RemoveThroughputObserver(this);
     network_quality_estimator_->RemoveEffectiveConnectionTypeObserver(this);
-    network_quality_estimator_->RemoveRTTAndThroughputEstimatesObserver(this);
   }
 
   // Stop NetLog observer if there is one.
@@ -627,7 +626,6 @@
     context_builder.set_socket_performance_watcher_factory(
         network_quality_estimator_->GetSocketPerformanceWatcherFactory());
     network_quality_estimator_->AddEffectiveConnectionTypeObserver(this);
-    network_quality_estimator_->AddRTTAndThroughputEstimatesObserver(this);
   }
 
   context_ = context_builder.Build();
@@ -871,18 +869,6 @@
   Java_CronetUrlRequestContext_onEffectiveConnectionTypeChanged(
       base::android::AttachCurrentThread(), jcronet_url_request_context_.obj(),
       effective_connection_type);
-}
-
-void CronetURLRequestContextAdapter::OnRTTOrThroughputEstimatesComputed(
-    base::TimeDelta http_rtt,
-    base::TimeDelta transport_rtt,
-    int32_t downstream_throughput_kbps) {
-  DCHECK(GetNetworkTaskRunner()->BelongsToCurrentThread());
-
-  Java_CronetUrlRequestContext_onRTTOrThroughputEstimatesComputed(
-      base::android::AttachCurrentThread(), jcronet_url_request_context_.obj(),
-      http_rtt.InMilliseconds(), transport_rtt.InMilliseconds(),
-      downstream_throughput_kbps);
 }
 
 void CronetURLRequestContextAdapter::OnRTTObservation(