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

components/history/core/browser/history_types_unittest.cc

 // Copyright (c) 2011 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 <stddef.h>
+
 #include "base/strings/utf_string_conversions.h"
 #include "components/history/core/browser/history_types.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace history {
 
 namespace {
 
 // Validates the consistency of the given history result. We just make sure
 // that the URL rows match the indices structure. The unit tests themselves
@@ skipping 94 matching lines @@
   ASSERT_EQ(1U, match_count);
   EXPECT_TRUE(matches[0] == 0);
 
   // Delete the second URL, there should be nothing left.
   results.DeleteURL(url2);
   EXPECT_EQ(0U, results.size());
   EXPECT_FALSE(results.MatchesForURL(url2, NULL));
 }
 
 }  // namespace history