Switch to standard integer types in components/, part 3 of 4.

components/proximity_auth/logging/log_buffer.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_PROXIMITY_AUTH_LOGGING_LOG_BUFFER_H
 #define COMPONENTS_PROXIMITY_AUTH_LOGGING_LOG_BUFFER_H
 
+#include <stddef.h>
+
 #include <list>
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/time/time.h"
 
 namespace proximity_auth {
 
 // Contains logs specific to the Proximity Auth. This buffer has a maximum size
@@ skipping 54 matching lines @@
 
   // List of observers.
   base::ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(LogBuffer);
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_LOGGING_LOG_BUFFER_H