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

components/user_prefs/tracked/tracked_split_preference.h

 // 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.
 
 #ifndef COMPONENTS_USER_PREFS_TRACKED_TRACKED_SPLIT_PREFERENCE_H_
 #define COMPONENTS_USER_PREFS_TRACKED_TRACKED_SPLIT_PREFERENCE_H_
 
+#include <stddef.h>
+
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "components/user_prefs/tracked/pref_hash_filter.h"
 #include "components/user_prefs/tracked/tracked_preference.h"
 #include "components/user_prefs/tracked/tracked_preference_helper.h"
 
 class TrackedPreferenceValidationDelegate;
 
@@ skipping 20 matching lines @@
 
  private:
   const std::string pref_path_;
   const TrackedPreferenceHelper helper_;
   TrackedPreferenceValidationDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(TrackedSplitPreference);
 };
 
 #endif  // COMPONENTS_USER_PREFS_TRACKED_TRACKED_SPLIT_PREFERENCE_H_