Revert "[Sync] Add version info to about:sync"

chrome/browser/sync/sync_ui_util.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.
 
 #ifndef CHROME_BROWSER_SYNC_SYNC_UI_UTIL_H_
 #define CHROME_BROWSER_SYNC_SYNC_UI_UTIL_H_
 #pragma once
 
 #include <string>
 
@@ skipping 65 matching lines @@
 void ConstructAboutInformation(ProfileSyncService* service,
                                DictionaryValue* strings);
 
 void AddIntSyncDetail(base::ListValue* details,
                       const std::string& stat_name,
                       int64 stat_value);
 
 void AddStringSyncDetails(ListValue* details, const std::string& stat_name,
                           const std::string& stat_value);
 
-// Returns a string describing the chrome version environment. Version format:
-// <Build Info> <OS> <Version number> (<Last change>)<channel or "-devel">
-// If version information is unavailable, returns "invalid."
-// TODO(zea): this approximately matches MakeUserAgentForSyncApi in
-// sync_backend_host.cc. Unify the two if possible.
-std::string GetVersionString();
-
 }  // namespace sync_ui_util
 #endif  // CHROME_BROWSER_SYNC_SYNC_UI_UTIL_H_