Keep track of network error in ProxyRetryInfo.

chrome/browser/net/chrome_network_delegate.h

Index: chrome/browser/net/chrome_network_delegate.h
diff --git a/chrome/browser/net/chrome_network_delegate.h b/chrome/browser/net/chrome_network_delegate.h
index 07e9af725846c4cc0fb3e43d2969b064017d3bb4..0431a660c7a652c4ad599b54b134874307080107 100644
--- a/chrome/browser/net/chrome_network_delegate.h
+++ b/chrome/browser/net/chrome_network_delegate.h
@@ -216,8 +216,7 @@ class ChromeNetworkDelegate : public net::NetworkDelegate {
       const net::ProxyService& proxy_service,
       net::ProxyInfo* result) OVERRIDE;
   virtual void OnProxyFallback(const net::ProxyServer& bad_proxy,
-                               int net_error,
-                               bool did_fallback) OVERRIDE;
+                               int net_error) OVERRIDE;
   virtual int OnBeforeSendHeaders(net::URLRequest* request,
                                   const net::CompletionCallback& callback,
                                   net::HttpRequestHeaders* headers) OVERRIDE;