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

chrome/installer/util/master_preferences_constants.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 the constants used to process master_preferences files
 // used by setup and first run.
 
 #ifndef CHROME_INSTALLER_UTIL_MASTER_PREFERENCES_CONSTANTS_H_
 #define CHROME_INSTALLER_UTIL_MASTER_PREFERENCES_CONSTANTS_H_
 
 namespace installer {
 namespace master_preferences {
 // All the preferences below are expected to be inside the JSON "distribution"
 // block. Some of them also have equivalent command line option. If same option
 // is specified in master preference as well as command line, the command line
 // value takes precedence.
 
 // Boolean pref that disables all logging.
 extern const char kDisableLogging[];
 // Name of the dictionary that holds the distribution values.
 extern const char kDistroDict[];
-// Boolean pref that triggers silent import of the default browser bookmarks.
-extern const char kDistroImportBookmarksPref[];
 // String pref that triggers silent import of bookmarks from the html file at
 // given path.
 extern const char kDistroImportBookmarksFromFilePref[];
-// Boolean pref that triggers silent import of the default browser history.
-extern const char kDistroImportHistoryPref[];
-// Boolean pref that triggers silent import of the default browser homepage.
-extern const char kDistroImportHomePagePref[];
-// Boolean pref that triggers silent import of the default search engine.
-extern const char kDistroImportSearchPref[];
 // String of Chrome version for which the "set as default browser" infobar will
 // never be shown.
 extern const char kDistroSuppressDefaultBrowserPromptPref[];
 // Boolean. Do not show first run bubble, even if it would otherwise be shown.
 extern const char kDistroSuppressFirstRunBubble[];
 // Boolean that specifies whether or not showing the welcome page following an
 // OS upgrade is enabled. True by default. May be overridden by the
 // WelcomePageOnOSUpgradeEnabled policy setting.
 extern const char kDistroWelcomePageOnOSUpgradeEnabled[];
 // Boolean. Prevent creation of all shortcuts to chrome, including the
@@ skipping 37 matching lines @@
 extern const char kVerboseLogging[];
 // Name of the block that contains the extensions on the master preferences.
 extern const char kExtensionsBlock[];
 // Boolean. Allow Chrome to be downgraded to a previous version if true.
 extern const char kAllowDowngrade[];
 
 }  // namespace master_preferences
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_MASTER_PREFERENCES_CONSTANTS_H_