Drop empty [] for dictionaries and interfaces in IDL files

third_party/WebKit/Source/modules/vr/VRDisplayCapabilities.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.
 
 // http://mozvr.github.io/webvr-spec/webvr.html#vrdisplaycapabilities
 [
     RuntimeEnabled=WebVR
 ] interface VRDisplayCapabilities {
   // Whether or not the VR display is capable of reporting user orientation.
   readonly attribute boolean hasOrientation;
@@ skipping 10 matching lines @@
 
   // Whether or not the VRDisplay is capable of presenting content to an HMD or
   // similar device. Can be used to indicate “magic window” devices that are
   // capable of 6DoF tracking but for which requestPresent is not meaningful. If
   // false then calls to requestPresent should always fail, and getEyeParameters
   // should return null.
   readonly attribute boolean canPresent;
 
   // The maximum length of the array that VRDisplay.requestPresent will accept.
   readonly attribute unsigned long maxLayers;
-};
+};