Remove multi-install from installer_util.

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 152 matching lines @@
   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_;
   }
 
-  bool is_multi_install() const { return false; }
-
   // Returns a reference to this MasterPreferences' root dictionary of values.
   const base::DictionaryValue& master_dictionary() const {
     return *master_dictionary_.get();
   }
 
   // Returns a static preference object that has been initialized with the
   // CommandLine object for the current process.
   // NOTE: Must not be called before CommandLine::Init() is called!
   // OTHER NOTE: Not thread safe.
   static const MasterPreferences& ForCurrentProcess();
@@ skipping 19 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_