Removed "disable-first-run-ui" flag and switch.

chromeos/chromeos_switches.cc

Index: chromeos/chromeos_switches.cc
diff --git a/chromeos/chromeos_switches.cc b/chromeos/chromeos_switches.cc
index 77cf81ba93670c963f17511f9aae0f38bc5648fb..82915335a91a9c9d555bf530160a40ecd32ae6ed 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -200,9 +200,6 @@ const char kStubCrosSettings[]              = "stub-cros-settings";
 // Disables SAML sigin support.
 const char kDisableSamlSignin[]             = "disable-saml-signin";
 
-// Disables new first-run overlay UI.
-const char kDisableFirstRunUI[] = "disable-first-run-ui";
-
 // Enables animated transitions during first-run tutorial.
 const char kEnableFirstRunUITransitions[] = "enable-first-run-ui-transitions";