[Cleanup] Remove the obsolete variations_seed pref.

chrome/browser/first_run/first_run.h

 // 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.
 
 #ifndef CHROME_BROWSER_FIRST_RUN_FIRST_RUN_H_
 #define CHROME_BROWSER_FIRST_RUN_FIRST_RUN_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 64 matching lines @@
   // remove items from here which are being stored temporarily only to be later
   // dumped into local_state. Also see related TODO in chrome_browser_main.cc.
 
   bool make_chrome_default_for_user = false;
   bool suppress_first_run_default_browser_prompt = false;
   bool welcome_page_on_os_upgrade_enabled = true;
   std::vector<GURL> new_tabs;
   std::vector<GURL> bookmarks;
   std::string import_bookmarks_path;
   std::string compressed_variations_seed;
-  std::string variations_seed;
   std::string variations_seed_signature;
   std::string suppress_default_browser_prompt_for_version;
 };
 
 void RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry);
 
 // Returns true if Chrome should behave as if this is the first time Chrome is
 // run for this user.
 bool IsChromeFirstRun();
@@ skipping 91 matching lines @@
 //
 // See chrome/installer/util/master_preferences.h for a description of
 // 'master_preferences' file.
 ProcessMasterPreferencesResult ProcessMasterPreferences(
     const base::FilePath& user_data_dir,
     MasterPrefs* out_prefs);
 
 }  // namespace first_run
 
 #endif  // CHROME_BROWSER_FIRST_RUN_FIRST_RUN_H_