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

net/base/dnsrr_resolver_unittest.cc

 // Copyright (c) 2011 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/base/dnsrr_resolver.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/synchronization/lock.h"
 #include "net/base/dns_util.h"
@@ skipping 79 matching lines @@
   ASSERT_EQ(3u, resolver.requests());
   ASSERT_EQ(2u, resolver.cache_hits());
   ASSERT_EQ(0u, resolver.inflight_joins());
 
   // Test what happens in the event of a network config change.
   handle = resolver.Resolve("nx.testing.notatld", kDNS_TESTING, 0,
                             callback.callback(), &response, 0, BoundNetLog());
   ASSERT_TRUE(handle != DnsRRResolver::kInvalidHandle);
   resolver.OnIPAddressChanged();
   ASSERT_TRUE(callback.have_result());
-  ASSERT_EQ(ERR_ABORTED, callback.WaitForResult());
+  ASSERT_EQ(ERR_NETWORK_CHANGED, callback.WaitForResult());
   ASSERT_EQ(4u, resolver.requests());
   ASSERT_EQ(2u, resolver.cache_hits());
   ASSERT_EQ(0u, resolver.inflight_joins());
 
   // Test an inflight join. (Note that this depends on the cache being flushed
   // by OnIPAddressChanged.)
   TestCompletionCallback callback2;
   DnsRRResolver::Handle handle2;
   handle = resolver.Resolve("nx.testing.notatld", kDNS_TESTING, 0,
                             callback.callback(), &response, 0, BoundNetLog());
@@ skipping 91 matching lines @@
     copy[byte] ^= (1 << bit);
 
     response.ParseFromResponse(copy, sizeof(copy), kDNS_TXT);
   }
 }
 #endif
 
 }  // namespace
 
 }  // namespace net