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 37683b033b47f9bc1da005ccf1afca2204f70ca9..d69e0eb1a4c4397d0fd21c01eb3284d807baaaf7 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -443,11 +443,10 @@ 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);
   }
 }