[Cleanup] Remove the obsolete variations_seed pref.

chrome/installer/util/master_preferences.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.
 //
 // This file contains functions processing master preference file used by
 // setup and first run.
 
 #ifndef CHROME_INSTALLER_UTIL_MASTER_PREFERENCES_H_
 #define CHROME_INSTALLER_UTIL_MASTER_PREFERENCES_H_
 
@@ skipping 143 matching lines @@
   //           }
   //        }
   //     }
   //  }
   //
   bool GetExtensionsBlock(base::DictionaryValue** extensions) const;
 
   // Returns the compressed variations seed entry from the master prefs.
   std::string GetCompressedVariationsSeed() const;
 
-  // Returns the variations seed entry from the master prefs.
-  std::string GetVariationsSeed() const;
-
   // Returns the variations seed signature entry from the master prefs.
   std::string GetVariationsSeedSignature() const;
 
   // Returns true iff the master preferences were successfully read from a file.
   bool read_from_file() const {
     return preferences_read_from_file_;
   }
 
   // Returns a reference to this MasterPreferences' root dictionary of values.
   const base::DictionaryValue& master_dictionary() const {
@@ skipping 27 matching lines @@
   base::DictionaryValue* distribution_ = nullptr;
   bool preferences_read_from_file_ = false;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MasterPreferences);
 };
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_MASTER_PREFERENCES_H_