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

chrome/installer/util/master_preferences_constants.cc

Index: chrome/installer/util/master_preferences_constants.cc
diff --git a/chrome/installer/util/master_preferences_constants.cc b/chrome/installer/util/master_preferences_constants.cc
index 0af4ab94366028947141995e7a2f4ab8cee08070..61cea54910593670846f4ce3a9fa8d6e4c22ed5c 100644
--- a/chrome/installer/util/master_preferences_constants.cc
+++ b/chrome/installer/util/master_preferences_constants.cc
@@ -6,15 +6,10 @@
 
 namespace installer {
 namespace master_preferences {
-  const char kCreateAllShortcuts[] = "create_all_shortcuts";
   const char kDisableLogging[] = "disable_logging";
   const char kDistroDict[] = "distribution";
-  const char kDistroImportBookmarksPref[] = "import_bookmarks";
   const char kDistroImportBookmarksFromFilePref[] =
       "import_bookmarks_from_file";
-  const char kDistroImportHistoryPref[] = "import_history";
-  const char kDistroImportHomePagePref[] = "import_home_page";
-  const char kDistroImportSearchPref[] = "import_search_engine";
   const char kDistroPingDelay[] = "ping_delay";
   const char kDistroSuppressDefaultBrowserPromptPref[] =
       "suppress_default_browser_prompt_for_version";