[Sync] Move //sync to //components/sync.

sync/internal_api/public/base/node_ordinal.cc

-// Copyright (c) 2012 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 "sync/internal_api/public/base/node_ordinal.h"
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <algorithm>
-#include <string>
-
-namespace syncer {
-
-NodeOrdinal Int64ToNodeOrdinal(int64_t x) {
-  uint64_t y = static_cast<uint64_t>(x);
-  y ^= 0x8000000000000000ULL;
-  std::string bytes(NodeOrdinal::kMinLength, '\x00');
-  if (y == 0) {
-    // 0 is a special case since |bytes| must not be all zeros.
-    bytes.push_back('\x80');
-  } else {
-    for (int i = 7; i >= 0; --i) {
-      bytes[i] = static_cast<uint8_t>(y);
-      y >>= 8;
-    }
-  }
-  NodeOrdinal ordinal(bytes);
-  DCHECK(ordinal.IsValid());
-  return ordinal;
-}
-
-int64_t NodeOrdinalToInt64(const NodeOrdinal& ordinal) {
-  uint64_t y = 0;
-  const std::string& s = ordinal.ToInternalValue();
-  size_t l = NodeOrdinal::kMinLength;
-  if (s.length() < l) {
-    NOTREACHED();
-    l = s.length();
-  }
-  for (size_t i = 0; i < l; ++i) {
-    const uint8_t byte = s[l - i - 1];
-    y |= static_cast<uint64_t>(byte) << (i * 8);
-  }
-  y ^= 0x8000000000000000ULL;
-  // This is technically implementation-defined if y > INT64_MAX, so
-  // we're assuming that we're on a twos-complement machine.
-  return static_cast<int64_t>(y);
-}
-
-}  // namespace syncer