Remove all uses of the HAVE_CONFIG_H define.

webrtc/base/proxydetect.h

 /*
  *  Copyright 2007 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef _PROXYDETECT_H_
 #define _PROXYDETECT_H_
 
 #include "webrtc/base/proxyinfo.h"
 
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
 namespace rtc {
 // Auto-detect the proxy server.  Returns true if a proxy is configured,
 // although hostname may be empty if the proxy is not required for
 // the given URL.
 
 bool GetProxySettingsForUrl(const char* agent, const char* url,
                             rtc::ProxyInfo* proxy,
                             bool long_operation = false);
 
 }  // namespace rtc
 
 #endif  // _PROXYDETECT_H_