cros: Enable encryption migration UI by default.

chrome/browser/chromeos/login/existing_user_controller.cc

Index: chrome/browser/chromeos/login/existing_user_controller.cc
diff --git a/chrome/browser/chromeos/login/existing_user_controller.cc b/chrome/browser/chromeos/login/existing_user_controller.cc
index e7d56876195f55dec908ab841af799852df970f9..8217396308c9f0589a577699fb8ad74970e88e3d 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.cc
+++ b/chrome/browser/chromeos/login/existing_user_controller.cc
@@ -179,8 +179,8 @@ void RecordPasswordChangeFlow(LoginPasswordChangeFlow flow) {
 }
 
 bool ShouldForceDircrypto() {
-  return base::CommandLine::ForCurrentProcess()->HasSwitch(
-             chromeos::switches::kEnableEncryptionMigration) &&
+  return !base::CommandLine::ForCurrentProcess()->HasSwitch(
+             chromeos::switches::kDisableEncryptionMigration) &&
          (arc::IsArcAvailable() || arc::IsArcKioskAvailable());
 }