Pass /nomitag to GoogleUpdateSetup.

chrome/installer/util/google_update_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.
 
 #include "chrome/installer/util/google_update_util.h"
 
 #include <algorithm>
 #include <map>
 #include <utility>
 #include <vector>
@@ skipping 52 matching lines @@
 
 // If Google Update is present at system-level, sets |cmd_string| to the command
 // line to install Google Update at user-level and returns true.
 // Otherwise, clears |cmd_string| and returns false.
 bool GetUserLevelGoogleUpdateInstallCommandLine(string16* cmd_string) {
   cmd_string->clear();
   base::FilePath google_update_setup(
       GetGoogleUpdateSetupExe(true));  // system-level.
   if (!google_update_setup.empty()) {
     CommandLine cmd(google_update_setup);
-    // Appends parameter "/install runtime=true&needsadmin=false /silent"
+    // Appends "/install runtime=true&needsadmin=false /silent /nomitag".
+    // NB: /nomitag needs to be at the end.
     // Constants are found in code.google.com/p/omaha/common/const_cmd_line.h.
     cmd.AppendArg("/install");
     // The "&" can be used in base::LaunchProcess() without quotation
     // (this is problematic only if run from command prompt).
     cmd.AppendArg("runtime=true&needsadmin=false");
     cmd.AppendArg("/silent");
+    cmd.AppendArg("/nomitag");
     *cmd_string = cmd.GetCommandLineString();
   }
   return !cmd_string->empty();
 }
 
 // Launches command |cmd_string|, and waits for |timeout| milliseconds before
 // timing out.  To wait indefinitely, one can set
 // |timeout| to be base::TimeDelta::FromMilliseconds(INFINITE).
 // Returns true if this executes successfully.
 // Returns false if command execution fails to execute, or times out.
@@ skipping 117 matching lines @@
     std::map<std::string, std::string>::const_iterator data_it(
         untrusted_data.find(key));
     if (data_it != untrusted_data.end())
       return data_it->second;
   }
 
   return std::string();
 }
 
 }  // namespace google_update