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

components/leveldb_proto/proto_database_impl_unittest.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/leveldb_proto/proto_database_impl.h"
 
+#include <stddef.h>
+
 #include <map>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/location.h"
 #include "base/run_loop.h"
 #include "base/threading/thread.h"
 #include "components/leveldb_proto/leveldb_database.h"
 #include "components/leveldb_proto/testing/proto/test.pb.h"
@@ skipping 417 matching lines @@
 
   ASSERT_TRUE(db->Save(save_entries, remove_keys));
 
   std::vector<std::string> second_load_entries;
 
   ASSERT_TRUE(db->Load(&second_load_entries));
   EXPECT_EQ(1u, second_load_entries.size());
 }
 
 }  // namespace leveldb_proto