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

components/variations/active_field_trials.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/active_field_trials.h"
 
+#include <stddef.h>
+
 #include <vector>
 
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/variations/metrics_util.h"
 
 namespace variations {
 
 namespace {
 
@@ skipping 46 matching lines @@
 void TestGetFieldTrialActiveGroupIds(
     const base::FieldTrial::ActiveGroups& active_groups,
     std::vector<ActiveGroupId>* name_group_ids) {
   GetFieldTrialActiveGroupIdsForActiveGroups(active_groups,
                                              name_group_ids);
 }
 
 }  // namespace testing
 
 }  // namespace variations