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 786a2795896deb0b2bcd8c2406ef9e14004c8950..cf12a9fe8b90963d0634937612513bec125c1515 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -96,10 +96,6 @@ 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