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

chrome/installer/util/master_preferences_constants.h

Index: chrome/installer/util/master_preferences_constants.h
diff --git a/chrome/installer/util/master_preferences_constants.h b/chrome/installer/util/master_preferences_constants.h
index 92bbe4b5f0a898d3ce2a02ddeae4b637fb0396cf..43679944cb682c1bcb122c43c5ef89b820c5e84e 100644
--- a/chrome/installer/util/master_preferences_constants.h
+++ b/chrome/installer/util/master_preferences_constants.h
@@ -26,15 +26,19 @@ 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.
+// Deprecated, use prefs::kImportBookmarks instead.
 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.
+// Deprecated, use prefs::kImportHistory instead.
 extern const char kDistroImportHistoryPref[];
 // Boolean pref that triggers silent import of the default browser homepage.
+// Deprecated, use prefs::kImportHomepage instead.
 extern const char kDistroImportHomePagePref[];
 // Boolean pref that triggers silent import of the default search engine.
+// Deprecated, use prefs::kImportSearchEngine instead.
 extern const char kDistroImportSearchPref[];
 // Integer. RLZ ping delay in seconds.
 extern const char kDistroPingDelay[];