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

components/variations/variations_http_header_provider.cc

 // Copyright 2014 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/variations/variations_http_header_provider.h"
 
+#include <stddef.h>
+
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/base64.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ skipping 204 matching lines @@
 
   std::set<VariationID> all_variation_ids_set = default_variation_ids_set_;
   for (VariationID id : variation_ids_set_)
     all_variation_ids_set.insert(id);
   for (VariationID id : synthetic_variation_ids_set_)
     all_variation_ids_set.insert(id);
   return all_variation_ids_set;
 }
 
 }  // namespace variations