Drop empty [] for dictionaries and interfaces in IDL files

third_party/WebKit/Source/modules/indexeddb/IDBObserverChanges.idl

 // 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.
 
 // https://github.com/WICG/indexed-db-observers/blob/gh-pages/EXPLAINER.md#changes-argument
 
 [
    Exposed=(Window, Worker),
    RuntimeEnabled=IDBObserver
 ] interface IDBObserverChanges {
     readonly attribute IDBDatabase database;
     // Transaction contains the same object stores as the transaction on which IDBTransaction.observe was called.
     readonly attribute IDBTransaction transaction;
     // Map object from String (object store name) to Array of IDBObservation.
     [CallWith=ScriptState] readonly attribute any records;
 };
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