Keep track of network error in ProxyRetryInfo.

chrome/browser/net/chrome_network_delegate.cc

Index: chrome/browser/net/chrome_network_delegate.cc
diff --git a/chrome/browser/net/chrome_network_delegate.cc b/chrome/browser/net/chrome_network_delegate.cc
index 3d0f1b62094f43b673b08e6e476bc14a16313171..ceb5370ba6310199e81cd46bf9c634bc751c7ff9 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -435,11 +435,10 @@ void ChromeNetworkDelegate::OnResolveProxy(
 }
 
 void ChromeNetworkDelegate::OnProxyFallback(const net::ProxyServer& bad_proxy,
-                                            int net_error,
-                                            bool did_fallback) {
+                                            int net_error) {
   if (data_reduction_proxy_usage_stats_) {
     data_reduction_proxy_usage_stats_->RecordBypassEventHistograms(
-        bad_proxy, net_error, did_fallback);
+        bad_proxy, net_error);
   }
 }