Revert 102184 - [Sync] use base::Time in sync

chrome/browser/sync/util/time.h

-// 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.
-//
-// Time-related sync functions.
-
-#ifndef CHROME_BROWSER_SYNC_UTIL_TIME_H_
-#define CHROME_BROWSER_SYNC_UTIL_TIME_H_
-#pragma once
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/time.h"
-
-namespace browser_sync {
-
-// Converts a time object to the format used in sync protobufs (ms
-// since the Unix epoch).
-int64 TimeToProtoTime(const base::Time& t);
-
-// Converts a time field from sync protobufs to a time object.
-base::Time ProtoTimeToTime(int64 proto_t);
-
-std::string GetTimeDebugString(const base::Time& t);
-
-}  // namespace browser_sync
-
-#endif  // CHROME_BROWSER_SYNC_UTIL_TIME_H_