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

net/socket/transport_client_socket_pool_unittest.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/socket/transport_client_socket_pool.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
@@ skipping 965 matching lines @@
 
     EXPECT_EQ(OK, callback.WaitForResult());
     EXPECT_TRUE(handle.is_initialized());
     EXPECT_TRUE(handle.socket());
 
     // One socket is stalled, the other is active.
     EXPECT_EQ(0, pool_.IdleSocketCount());
     handle.Reset();
 
     // Close all pending connect jobs and existing sockets.
-    pool_.Flush();
+    pool_.FlushWithError(ERR_NETWORK_CHANGED);
   }
 }
 
 // Test the case where a socket took long enough to start the creation
 // of the backup socket, but then we cancelled the request after that.
 TEST_F(TransportClientSocketPoolTest, BackupSocketCancel) {
   client_socket_factory_.set_client_socket_type(
       MockClientSocketFactory::MOCK_STALLED_CLIENT_SOCKET);
 
   enum { CANCEL_BEFORE_WAIT, CANCEL_AFTER_WAIT };
@@ skipping 277 matching lines @@
   EXPECT_TRUE(handle.socket());
   IPEndPoint endpoint;
   handle.socket()->GetLocalAddress(&endpoint);
   EXPECT_EQ(kIPv4AddressSize, endpoint.address().size());
   EXPECT_EQ(1, client_socket_factory_.allocation_count());
 }
 
 }  // namespace
 
 }  // namespace net