Disallow repeated PushManager.subscribes with different sender ids

third_party/WebKit/public/platform/modules/push_messaging/WebPushError.h

 // Copyright 2014 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.
 
 #ifndef WebPushError_h
 #define WebPushError_h
 
 #include "public/platform/WebString.h"
 
 namespace blink {
 
 struct WebPushError {
   enum ErrorType {
     ErrorTypeAbort = 0,
     ErrorTypeNetwork,
     ErrorTypeNotAllowed,
     ErrorTypeNotFound,
     ErrorTypeNotSupported,
     ErrorTypeUnknown,
-    ErrorTypeLast = ErrorTypeUnknown
+    ErrorTypeInvalidState,
+    ErrorTypeLast = ErrorTypeInvalidState
   };
 
   WebPushError(ErrorType errorType, const WebString& message)
       : errorType(errorType), message(message) {}
 
   ErrorType errorType;
   WebString message;
 };
 
 }  // namespace blink
 
 #endif  // WebPushError_h