[Cleanup] Remove the obsolete variations_seed pref.

chrome/installer/util/master_preferences.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/installer/util/master_preferences.h"
 
 #include <stddef.h>
 
 #include "base/environment.h"
 #include "base/files/file_util.h"
@@ skipping 277 matching lines @@
 bool MasterPreferences::GetExtensionsBlock(
     base::DictionaryValue** extensions) const {
   return master_dictionary_->GetDictionary(
       master_preferences::kExtensionsBlock, extensions);
 }
 
 std::string MasterPreferences::GetCompressedVariationsSeed() const {
   return ExtractPrefString(variations::prefs::kVariationsCompressedSeed);
 }
 
-std::string MasterPreferences::GetVariationsSeed() const {
-  return ExtractPrefString(variations::prefs::kVariationsSeed);
-}
-
 std::string MasterPreferences::GetVariationsSeedSignature() const {
   return ExtractPrefString(variations::prefs::kVariationsSeedSignature);
 }
 
 std::string MasterPreferences::ExtractPrefString(
     const std::string& name) const {
   std::string result;
   std::unique_ptr<base::Value> pref_value;
   if (master_dictionary_->Remove(name, &pref_value)) {
     if (!pref_value->GetAsString(&result))
       NOTREACHED();
   }
   return result;
 }
 
 // static
 const MasterPreferences& MasterPreferences::ForCurrentProcess() {
   return g_master_preferences.Get();
 }
 
 }  // namespace installer