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

webrtc/base/rtccertificate.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.
  */
 
@@ skipping 10 matching lines @@
 }
 
 RTCCertificate::RTCCertificate(SSLIdentity* identity)
     : identity_(identity) {
   RTC_DCHECK(identity_);
 }
 
 RTCCertificate::~RTCCertificate() {
 }
 
-uint64 RTCCertificate::expires_timestamp_ns() const {
+uint64_t RTCCertificate::expires_timestamp_ns() const {
   // TODO(hbos): Update once SSLIdentity/SSLCertificate supports expires field.
   return 0;
 }
 
 bool RTCCertificate::HasExpired() const {
   return expires_timestamp_ns() <= TimeNanos();
 }
 
 const SSLCertificate& RTCCertificate::ssl_certificate() const {
   return identity_->certificate();
 }
 
 }  // namespace rtc