Introduce ERR_NETWORK_CHANGED and allow URLFetcher to automatically retry on that error.

net/http/http_pipelined_connection_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_pipelined_connection_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/message_loop.h"
 #include "base/stl_util.h"
@@ skipping 684 matching lines @@
 
 void HttpPipelinedConnectionImpl::CheckHeadersForPipelineCompatibility(
     int pipeline_id,
     int result) {
   if (result < OK) {
     switch (result) {
       // TODO(simonjam): Ignoring specific errors like this may not work.
       // Collect metrics to see if this code is useful.
       case ERR_ABORTED:
       case ERR_INTERNET_DISCONNECTED:
+      case ERR_NETWORK_CHANGED:
         // These errors are no fault of the server.
         break;
 
       default:
         ReportPipelineFeedback(pipeline_id, PIPELINE_SOCKET_ERROR);
         break;
     }
     return;
   }
   HttpResponseInfo* info = GetResponseInfo(pipeline_id);
@@ skipping 115 matching lines @@
 }
 
 HttpPipelinedConnectionImpl::StreamInfo::StreamInfo()
     : state(STREAM_CREATED) {
 }
 
 HttpPipelinedConnectionImpl::StreamInfo::~StreamInfo() {
 }
 
 }  // namespace net