Show different error message if ARC is disabled.

chrome/browser/chromeos/arc/arc_optin_uma.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/arc/arc_optin_uma.h"
 
 #include <string>
 
 #include "base/metrics/histogram_macros.h"
 
@@ skipping 63 matching lines @@
     MAP_PROVISIONING_RESULT(DEVICE_CHECK_IN_TIMEOUT);
     MAP_PROVISIONING_RESULT(DEVICE_CHECK_IN_INTERNAL_ERROR);
     MAP_PROVISIONING_RESULT(GMS_SIGN_IN_FAILED);
     MAP_PROVISIONING_RESULT(GMS_SIGN_IN_TIMEOUT);
     MAP_PROVISIONING_RESULT(GMS_SIGN_IN_INTERNAL_ERROR);
     MAP_PROVISIONING_RESULT(CLOUD_PROVISION_FLOW_TIMEOUT);
     MAP_PROVISIONING_RESULT(CLOUD_PROVISION_FLOW_INTERNAL_ERROR);
     MAP_PROVISIONING_RESULT(ARC_STOPPED);
     MAP_PROVISIONING_RESULT(OVERALL_SIGN_IN_TIMEOUT);
     MAP_PROVISIONING_RESULT(CHROME_SERVER_COMMUNICATION_ERROR);
+    MAP_PROVISIONING_RESULT(ARC_DISABLED);
     MAP_PROVISIONING_RESULT(SIZE);
   }
 
 #undef MAP_PROVISIONING_RESULT
 
   // Some compilers report an error even if all values of an enum-class are
   // covered exhaustively in a switch statement.
   NOTREACHED() << "Invalid value " << static_cast<int>(result);
   return os;
 }
 
 }  // namespace arc