[Cleanup] Remove the obsolete variations_seed pref.

chrome/browser/first_run/first_run.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 "chrome/browser/first_run/first_run.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
@@ skipping 454 matching lines @@
           &value) && value) {
     out_prefs->suppress_first_run_default_browser_prompt = true;
   }
 
   install_prefs.GetString(
       installer::master_preferences::kDistroImportBookmarksFromFilePref,
       &out_prefs->import_bookmarks_path);
 
   out_prefs->compressed_variations_seed =
       install_prefs.GetCompressedVariationsSeed();
-  out_prefs->variations_seed = install_prefs.GetVariationsSeed();
   out_prefs->variations_seed_signature =
       install_prefs.GetVariationsSeedSignature();
 
   install_prefs.GetString(
       installer::master_preferences::kDistroSuppressDefaultBrowserPromptPref,
       &out_prefs->suppress_default_browser_prompt_for_version);
 
   if (install_prefs.GetBool(
           installer::master_preferences::kDistroWelcomePageOnOSUpgradeEnabled,
           &value) &&
@@ skipping 246 matching lines @@
   SetShouldDoPersonalDataManagerFirstRun();
 
   internal::DoPostImportPlatformSpecificTasks(profile);
 }
 
 uint16_t auto_import_state() {
   return g_auto_import_state;
 }
 
 }  // namespace first_run