First step to remove SingleRequestHostResolver.

net/socket/websocket_transport_client_socket_pool.cc

 // Copyright 2014 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/websocket_transport_client_socket_pool.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/compiler_specific.h"
@@ skipping 94 matching lines @@
     }
   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
 
   return rv;
 }
 
 int WebSocketTransportConnectJob::DoResolveHost() {
   next_state_ = STATE_RESOLVE_HOST_COMPLETE;
   connect_timing_.dns_start = base::TimeTicks::Now();
 
-  return resolver_.Resolve(
+  return resolver_->Resolve(
       params_->destination(), priority(), &addresses_,
       base::Bind(&WebSocketTransportConnectJob::OnIOComplete,
                  base::Unretained(this)),
-      net_log());
+      &request_, net_log());
 }
 
 int WebSocketTransportConnectJob::DoResolveHostComplete(int result) {
   TRACE_EVENT0("net", "WebSocketTransportConnectJob::DoResolveHostComplete");
   connect_timing_.dns_end = base::TimeTicks::Now();
   // Overwrite connection start time, since for connections that do not go
   // through proxies, |connect_start| should not include dns lookup time.
   connect_timing_.connect_start = connect_timing_.dns_end;
 
   if (result != OK)
@@ skipping 550 matching lines @@
       handle(handle),
       callback(callback),
       net_log(net_log) {}
 
 WebSocketTransportClientSocketPool::StalledRequest::StalledRequest(
     const StalledRequest& other) = default;
 
 WebSocketTransportClientSocketPool::StalledRequest::~StalledRequest() {}
 
 }  // namespace net