Remove all uses of the HAVE_CONFIG_H define.

webrtc/base/proxydetect.cc

 /*
  *  Copyright 2004 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.
  */
 
 #include "webrtc/base/proxydetect.h"
 
 #if defined(WEBRTC_WIN)
 #include "webrtc/base/win32.h"
 #include <shlobj.h>
 #endif  // WEBRTC_WIN
 
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
 #if defined(WEBRTC_MAC) && !defined(WEBRTC_IOS)
 #include <SystemConfiguration/SystemConfiguration.h>
 #include <CoreFoundation/CoreFoundation.h>
 #include <CoreServices/CoreServices.h>
 #include <Security/Security.h>
 #include "macconversion.h"
 #endif
 
 #ifdef WEBRTC_IOS
 #include <CFNetwork/CFNetwork.h>
@@ skipping 1263 matching lines @@
     if (!result) {
       // Either auto detection is not supported or we simply didn't
       // find any proxy, reset type.
       proxy->type = rtc::PROXY_NONE;
     }
   }
   return result;
 }
 
 }  // namespace rtc