Keep track of network error in ProxyRetryInfo.

net/proxy/proxy_retry_info.h

Index: net/proxy/proxy_retry_info.h
diff --git a/net/proxy/proxy_retry_info.h b/net/proxy/proxy_retry_info.h
index 0d073b9c2cda6b165bc5de7985e370befeaece24..0b9eac77df3ba2229709a95dae5e5fbdd8420f06 100644
--- a/net/proxy/proxy_retry_info.h
+++ b/net/proxy/proxy_retry_info.h
@@ -24,6 +24,9 @@ struct ProxyRetryInfo {
 
   // True if this proxy should be considered even if still bad.
   bool try_while_bad;
+
+  // The network error we received when we tried to use this proxy.

[Ryan Sleevi, 2014/08/14 21:14:39]

Word it without the pronoun and it becomes clearer and more concise (
https://groups.google.com/a/chromium.org/d/msg/chromium-dev/NH-S6KCkr2M/yv0z3...
)

(Yes, I know of the existing uses in this file, but no reason not to have better
comments)

// The network error received when this proxy failed.

[Not at Google. Contact bengr, 2014/08/14 23:45:22]

Done.

+  int net_error;
 };
 
 // Map of proxy servers with the associated RetryInfo structures.