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

chrome/browser/first_run/first_run.h

Index: chrome/browser/first_run/first_run.h
diff --git a/chrome/browser/first_run/first_run.h b/chrome/browser/first_run/first_run.h
index b51318e9375d1722e7235a75014e8a3455eb7afd..3f6e9a87ecab28404ad2a41101707828d5f4240f 100644
--- a/chrome/browser/first_run/first_run.h
+++ b/chrome/browser/first_run/first_run.h
@@ -75,12 +75,9 @@ struct MasterPrefs {
   // remove items from here which are being stored temporarily only to be later
   // dumped into local_state. Also see related TODO in chrome_browser_main.cc.
 
-  bool homepage_defined;
-  int do_import_items;
-  int dont_import_items;
-  bool make_chrome_default_for_user;
-  bool suppress_first_run_default_browser_prompt;
-  bool welcome_page_on_os_upgrade_enabled;
+  bool make_chrome_default_for_user = false;
+  bool suppress_first_run_default_browser_prompt = false;
+  bool welcome_page_on_os_upgrade_enabled = true;
   std::vector<GURL> new_tabs;
   std::vector<GURL> bookmarks;
   std::string import_bookmarks_path;
@@ -158,13 +155,10 @@ bool ShouldDoPersonalDataManagerFirstRun();
 // Log a metric for the "FirstRun.SearchEngineBubble" histogram.
 void LogFirstRunMetric(FirstRunBubbleMetric metric);
 
-// Automatically import history and home page (and search engine, if
-// ShouldShowSearchEngineDialog is true). Also imports bookmarks from file if
+// Automatically imports items requested by |profile|'s configuration (sum of
+// policies and master prefs). Also imports bookmarks from file if
 // |import_bookmarks_path| is not empty.
 void AutoImport(Profile* profile,
-                bool homepage_defined,
-                int import_items,
-                int dont_import_items,
                 const std::string& import_bookmarks_path);
 
 // Does remaining first run tasks. This can pop the first run consent dialog on