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

components/proximity_auth/cryptauth/fake_secure_message_delegate.cc

 // 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.
 
 #include "components/proximity_auth/cryptauth/fake_secure_message_delegate.h"
 
+#include <stddef.h>
+
 #include <algorithm>
 
 #include "base/callback.h"
 #include "base/md5.h"
 #include "base/strings/string_util.h"
 
 namespace proximity_auth {
 
 namespace {
 
@@ skipping 172 matching lines @@
     callback.Run(false, std::string(), securemessage::Header());
   }
 }
 
 std::string FakeSecureMessageDelegate::GetPrivateKeyForPublicKey(
     const std::string& public_key) {
   return kPrivateKeyPrefix + public_key;
 }
 
 }  // namespace proximity_auth