Retry request upon GOAWAY frame with NO_ERROR.

net/base/net_error_list.h

Index: net/base/net_error_list.h
diff --git a/net/base/net_error_list.h b/net/base/net_error_list.h
index b9d713c835a8d75db5c459f9de78cd132973dee6..19f97d69d856518fb3c5e3fcb9284d9a14edd80d 100644
--- a/net/base/net_error_list.h
+++ b/net/base/net_error_list.h
@@ -642,8 +642,11 @@ NET_ERROR(RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION, -349)
 // The HTTP response contained multiple Location headers.
 NET_ERROR(RESPONSE_HEADERS_MULTIPLE_LOCATION, -350)
 
-// SPDY server refused the stream. Client should retry. This should never be a
-// user-visible error.
+// HTTP/2 server refused the request without processing, and sent either a
+// GOAWAY frame with error code NO_ERROR and Last-Stream-ID lower than the
+// stream id corresponding to the request indicating that this request has not
+// been processed yet, or a RST_STREAM frame with error code REFUSED_STREAM.
+// Client MAY retry (on a different connection).  See RFC7540 Section 8.1.4.

[Zhongyi Shi, 2017/04/19 00:40:27]

optional nit: there're two spaces before "See RFC7540...". Is that on purpose?

[Bence, 2017/04/19 12:12:15]

I usually write two spaces between sentences by default, but do not have strong
feelings about it and am not aware of any guidance in any of our style guides. 
I am leaving this for the time being because you said "optional", but I am happy
to change it to a single space if you prefer.

[Zhongyi Shi, 2017/04/19 17:19:18]

Acknowledged.

 NET_ERROR(SPDY_SERVER_REFUSED_STREAM, -351)
 
 // SPDY server didn't respond to the PING message.