Use correct case for including a file.

webrtc/base/winping.h

 /*
  *  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.
  */
 
 #ifndef WEBRTC_BASE_WINPING_H__
 #define WEBRTC_BASE_WINPING_H__
 
 #if defined(WEBRTC_WIN)
 
 #include "webrtc/base/win32.h"
 #include "webrtc/base/basictypes.h"
-#include "webrtc/base/IPAddress.h"
+#include "webrtc/base/ipaddress.h"
 
 namespace rtc {
 
 // This class wraps a Win32 API for doing ICMP pinging.  This API, unlike the
 // the normal socket APIs (as implemented on Win9x), will return an error if
 // an ICMP packet with the dont-fragment bit set is too large.  This means this
 // class can be used to detect the MTU to a given address.
 
 typedef struct ip_option_information {
     UCHAR   Ttl;                // Time To Live
@@ skipping 67 matching lines @@
     char* reply_;
     uint32_t rlen_;
     bool valid_;
 };
 
 } // namespace rtc
 
 #endif // WEBRTC_WIN 
 
 #endif // WEBRTC_BASE_WINPING_H__