IDL: Make enums have global visibility

Source/modules/indexeddb/IDBObjectStore.idl

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
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 // https://dvcs.w3.org/hg/IndexedDB/raw-file/default/Overview.html#idl-def-IDBObjectStore
 
-// FIXME: de-duplicate this when crbug.com/390758 is fixed.
-enum IDBCursorDirection {
-    "next",
-    "nextunique",
-    "prev",
-    "prevunique"
-};
-
 [
     GarbageCollected,
 ] interface IDBObjectStore {
     readonly attribute DOMString? name;
     [CallWith=ScriptState] readonly attribute any keyPath;
     readonly attribute DOMStringList indexNames;
     readonly attribute IDBTransaction transaction;
     readonly attribute boolean autoIncrement;
 
     [CallWith=ScriptState, RaisesException] IDBRequest put(any value, [Default=Undefined] optional any key);
     [CallWith=ScriptState, RaisesException] IDBRequest add(any value, [Default=Undefined] optional any key);
     [CallWith=ScriptState, ImplementedAs=deleteFunction, RaisesException] IDBRequest delete(any key);
     [CallWith=ScriptState, RaisesException] IDBRequest get(any key);
     [CallWith=ScriptState, RaisesException] IDBRequest clear();
     [CallWith=ScriptState, RaisesException] IDBRequest openCursor([Default=Undefined] optional any range, optional DOMString direction = "next");
     [CallWith=ScriptState, RaisesException, RuntimeEnabled=IndexedDBExperimental] IDBRequest openKeyCursor([Default=Undefined] optional any range, optional IDBCursorDirection direction = "next");
     [CallWith=ScriptState, RaisesException] IDBIndex createIndex(DOMString name, (DOMString or sequence<DOMString>) keyPath, optional IDBIndexParameters options);
     [RaisesException] IDBIndex index(DOMString name);
     [RaisesException] void deleteIndex(DOMString name);
     [CallWith=ScriptState, RaisesException] IDBRequest count([Default=Undefined] optional any key);
 };