Switch to standard integer types in chrome/browser/, part 2 of 4.

chrome/browser/metrics/perf/random_selector.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 CHROME_BROWSER_METRICS_PERF_RANDOM_SELECTOR_H_
 #define CHROME_BROWSER_METRICS_PERF_RANDOM_SELECTOR_H_
 
+#include <stddef.h>
+
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 
 // RandomSelector can be used to pick vectors of strings according to certain
 // probabilities. The probabilities are set using SetOdds(). A randomly picked
 // vector can be obtained by calling Select().
 //
 // Sample usage:
@@ skipping 64 matching lines @@
   // Sum of the probability weights.
   double sum_of_weights_;
 
   DISALLOW_COPY_AND_ASSIGN(RandomSelector);
 };
 
 ::std::ostream& operator<<(
     ::std::ostream& os, const RandomSelector::WeightAndValue& value);
 
 #endif  // CHROME_BROWSER_METRICS_PERF_RANDOM_SELECTOR_H_