Remove multi-install from installer_util.

chrome/installer/util/install_util.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.
 //
 // See the corresponding header file for description of the functions in this
 // file.
 
 #include "chrome/installer/util/install_util.h"
 
 #include <shellapi.h>
@@ skipping 301 matching lines @@
                          exe_path.value().data(), prefix_len,
                          program_files_path.value().data(), prefix_len) !=
       CSTR_EQUAL;
 }
 
 void InstallUtil::ResetIsPerUserInstallForTest() {
   std::unique_ptr<base::Environment> env(base::Environment::Create());
   env->UnSetVar(kEnvProgramFilesPath);
 }
 
-bool InstallUtil::IsMultiInstall(bool system_install) {
-  ProductState state;
-  return state.Initialize(system_install) && state.is_multi_install();
-}
-
 bool CheckIsChromeSxSProcess() {
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   CHECK(command_line);
 
   if (command_line->HasSwitch(installer::switches::kChromeSxS))
     return true;
 
   // Also return true if we are running from Chrome SxS installed path.
   base::FilePath exe_dir;
   PathService::Get(base::DIR_EXE, &exe_dir);
@@ skipping 290 matching lines @@
   // Open the program and see if it references the expected file.
   base::File file;
   BY_HANDLE_FILE_INFORMATION info = {};
 
   return (OpenForInfo(path, &file) &&
           GetInfo(file, &info) &&
           info.dwVolumeSerialNumber == file_info_.dwVolumeSerialNumber &&
           info.nFileIndexHigh == file_info_.nFileIndexHigh &&
           info.nFileIndexLow == file_info_.nFileIndexLow);
 }