Notify NetworkDelegate when bytes have been sent over the network.

net/base/network_delegate_impl.cc

Index: net/base/network_delegate_impl.cc
diff --git a/net/base/network_delegate_impl.cc b/net/base/network_delegate_impl.cc
index 3cc8c2196c965dbd52e42ffcfdbff05448c95d01..af4d708647bf95d49f12c684c3c635cdf509b417 100644
--- a/net/base/network_delegate_impl.cc
+++ b/net/base/network_delegate_impl.cc
@@ -59,6 +59,9 @@ void NetworkDelegateImpl::OnResponseStarted(URLRequest* request) {
 void NetworkDelegateImpl::OnNetworkBytesReceived(const URLRequest& request,
                                                  int64_t bytes_received) {}
 
+void NetworkDelegateImpl::OnNetworkBytesSent(const URLRequest& request,
+                                             int64_t bytes_sent) {}
+
 void NetworkDelegateImpl::OnCompleted(URLRequest* request, bool started) {
 }