Update AutoImport to import nothing by default (in absence of policy and master_prefs).

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 21 matching lines @@
 // The master preferences is a JSON file with the same entries as the
 // 'Default\Preferences' file. This function parses the distribution
 // section of the preferences file.
 //
 // A prototypical 'master_preferences' file looks like this:
 //
 // {
 //   "distribution": {
 //      "create_all_shortcuts": true,
 //      "do_not_launch_chrome": false,
-//      "import_bookmarks": false,
 //      "import_bookmarks_from_file": "c:\\path",
-//      "import_history": false,
-//      "import_home_page": false,
-//      "import_search_engine": true,
 //      "make_chrome_default": false,
 //      "make_chrome_default_for_user": true,
 //      "ping_delay": 40,
 //      "require_eula": true,
 //      "show_welcome_page": true,
 //      "skip_first_run_ui": true,
 //      "system_level": false,
 //      "verbose_logging": true,
 //      "welcome_page_on_os_upgrade_enabled": false
 //   },
 //   "browser": {
 //      "show_home_button": true
 //   },
 //   "bookmark_bar": {
 //      "show_on_all_tabs": true
 //   },
 //   "first_run_tabs": [
 //      "http://gmail.com",
 //      "https://igoogle.com"
 //   ],
 //   "homepage": "http://example.org",
-//   "homepage_is_newtabpage": false
+//   "homepage_is_newtabpage": false,
+//   "import_autofill_form_data": false,
+//   "import_bookmarks": false,
+//   "import_history": false,
+//   "import_home_page": false,
+//   "import_saved_passwords": false,
+//   "import_search_engine": false
 // }
 //
 // A reserved "distribution" entry in the file is used to group related
 // installation properties. This entry will be ignored at other times.
 // This function parses the 'distribution' entry and returns a combination
 // of MasterPrefResult.
 
 class MasterPreferences {
  public:
   // Construct a master preferences from the current process' current command
@@ skipping 123 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_