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 2a1aeed2917d0f40397762c4ec5f17721a3a9644..81aeae0eb2eda8ae642c637e6117c53f9378e679 100644
--- a/chrome/installer/util/master_preferences_constants.cc
+++ b/chrome/installer/util/master_preferences_constants.cc
@@ -8,12 +8,8 @@ namespace installer {
 namespace master_preferences {
   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 kDistroSuppressDefaultBrowserPromptPref[] =
       "suppress_default_browser_prompt_for_version";
   const char kDistroSuppressFirstRunBubble[] = "suppress_first_run_bubble";