Use suffixed {uint,int}{8,16,32,64}_t types.

webrtc/base/md5digest.cc

 /*
  *  Copyright 2015 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/md5digest.h"
 
 namespace rtc {
 
 size_t Md5Digest::Size() const {
   return kSize;
 }
 
 void Md5Digest::Update(const void* buf, size_t len) {
-  MD5Update(&ctx_, static_cast<const uint8*>(buf), len);
+  MD5Update(&ctx_, static_cast<const uint8_t*>(buf), len);
 }
 
 size_t Md5Digest::Finish(void* buf, size_t len) {
   if (len < kSize) {
     return 0;
   }
-  MD5Final(&ctx_, static_cast<uint8*>(buf));
+  MD5Final(&ctx_, static_cast<uint8_t*>(buf));
   MD5Init(&ctx_);  // Reset for next use.
   return kSize;
 }
 
 };  // namespace rtc