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

chrome/common/chrome_features.cc

Index: chrome/common/chrome_features.cc
diff --git a/chrome/common/chrome_features.cc b/chrome/common/chrome_features.cc
index f6abd1d5da772373c7e315e27d23eeea49ed2e60..a6bd5517754a98b154623ffe185db82a7a91cc67 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -88,10 +88,6 @@ const base::Feature kConsistentOmniboxGeolocation{
 // user promoting Chrome for iOS.
 const base::Feature kDesktopIOSPromotion{"DesktopIOSPromotion",
                                          base::FEATURE_DISABLED_BY_DEFAULT};
-
-// Disables the AutoImport feature on first run. See crbug.com/555550
-const base::Feature kDisableFirstRunAutoImportWin{
-    "DisableFirstRunAutoImport", base::FEATURE_DISABLED_BY_DEFAULT};
 #endif
 
 // Experiment to display a toggle allowing users to opt-out of persisting a