IDL: Make enums have global visibility

Source/modules/indexeddb/IDBIndex.idl

 /*
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 // http://www.w3.org/TR/IndexedDB/#idl-def-IDBIndex
 
-// FIXME: de-duplicate this when crbug.com/390758 is fixed.
-enum IDBCursorDirection {
-    "next",
-    "nextunique",
-    "prev",
-    "prevunique"
-};
-
 [
     GarbageCollected
 ] interface IDBIndex {
     readonly attribute DOMString name;
     readonly attribute IDBObjectStore objectStore;
     [CallWith=ScriptState] readonly attribute any keyPath;
     readonly attribute boolean unique;
     readonly attribute boolean multiEntry;
 
     [CallWith=ScriptState, RaisesException] IDBRequest openCursor([Default=Undefined] optional any range, optional IDBCursorDirection direction = "next");
     [CallWith=ScriptState, RaisesException] IDBRequest openKeyCursor([Default=Undefined] optional any range, optional IDBCursorDirection direction = "next");
 
     [CallWith=ScriptState, RaisesException] IDBRequest get(any key);
     [CallWith=ScriptState, RaisesException] IDBRequest getKey(any key);
     [CallWith=ScriptState, RaisesException] IDBRequest count([Default=Undefined] optional any key);
 };