Disable/enable echo for enterprise device.

chrome/browser/chromeos/settings/cros_settings_names.cc

Index: chrome/browser/chromeos/settings/cros_settings_names.cc
diff --git a/chrome/browser/chromeos/settings/cros_settings_names.cc b/chrome/browser/chromeos/settings/cros_settings_names.cc
index 6070081333f9a7d34d35cf50ad5b474b8764972f..4ac58d96f87d57f930ee20a21c16204383416bfd 100644
--- a/chrome/browser/chromeos/settings/cros_settings_names.cc
+++ b/chrome/browser/chromeos/settings/cros_settings_names.cc
@@ -83,4 +83,9 @@ const char kStartUpUrls[] = "cros.start_up_urls";
 // signal that we are running in a "safe-mode" for policy recovery.
 const char kPolicyMissingMitigationMode[] =
     "cros.internal.policy_mitigation_mode";
+
+// A boolean pref that indicates whether users are allowed to redeem offers
+// through Chrome OS Registration.
+const char kAllowRedeemChromeOsRegistrationOffers[] =
+    "cros.echo.allow_redeem_chrome_os_registration_offers";
 }  // namespace chromeos