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

components/url_matcher/substring_set_matcher_unittest.cc

 // Copyright 2013 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/url_matcher/substring_set_matcher.h"
 
+#include <stddef.h>
+
 #include <set>
 #include <string>
 #include <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace url_matcher {
 
 namespace {
 
@@ skipping 144 matching lines @@
 }
 
 TEST(SubstringSetMatcherTest, TestEmptyMatcher) {
   SubstringSetMatcher matcher;
   std::set<int> matches;
   matcher.Match("abd", &matches);
   EXPECT_TRUE(matches.empty());
 }
 
 }  // namespace url_matcher