Converted IDBVersionChangeEvent.dataLoss to an enumeration: IDBDataLossAmount

Source/modules/indexeddb/IDBVersionChangeEvent.idl

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
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  * modification, are permitted provided that the following conditions
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+// http://www.w3.org/TR/IndexedDB/#idl-def-IDBVersionChangeEvent
+
+// FIXME: This enum is non-standard, see
+// https://www.w3.org/Bugs/Public/show_bug.cgi?id=22370
+enum IDBDataLossAmount {
+    "none",
+    "total"
+};
 [
     EventConstructor
 ] interface IDBVersionChangeEvent : Event {
     [InitializedByEventConstructor] readonly attribute unsigned long long oldVersion;
     [InitializedByEventConstructor] readonly attribute unsigned long long? newVersion;
 
     // FIXME: These are non-standard, see
     // https://www.w3.org/Bugs/Public/show_bug.cgi?id=22370
-    readonly attribute DOMString dataLoss;
+    [InitializedByEventConstructor] readonly attribute IDBDataLossAmount dataLoss;
     readonly attribute DOMString dataLossMessage;
 };