[net] Switch TestURLRequestContext to use MockCachingHostResolver.

net/socket_stream/socket_stream.h

 // 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.
 
 #ifndef NET_SOCKET_STREAM_SOCKET_STREAM_H_
 #define NET_SOCKET_STREAM_SOCKET_STREAM_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 150 matching lines @@
   // Should be used for response of OnAuthRequired.
   virtual void RestartWithAuth(const AuthCredentials& credentials);
 
   // Detach delegate.  Call before delegate is deleted.
   // Once delegate is detached, close the socket stream and never call delegate
   // back.
   virtual void DetachDelegate();
 
   const ProxyServer& proxy_server() const;
 
-  // Sets an alternative HostResolver. For testing purposes only.
-  void SetHostResolver(HostResolver* host_resolver);
-
   // Sets an alternative ClientSocketFactory.  Doesn't take ownership of
   // |factory|.  For testing purposes only.
   void SetClientSocketFactory(ClientSocketFactory* factory);
 
   // Cancels the connection because of an error.
   // |error| is net::Error which represents the error.
   void CancelWithError(int error);
 
   // Cancels the connection because of receiving a certificate with an error.
   void CancelWithSSLError(const SSLInfo& ssl_info);
@@ skipping 193 matching lines @@
   bool server_closed_;
 
   scoped_ptr<SocketStreamMetrics> metrics_;
 
   DISALLOW_COPY_AND_ASSIGN(SocketStream);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_STREAM_SOCKET_STREAM_H_