Add an Origin Trial for Navigator.getInstalledRelatedApps.

third_party/WebKit/Source/modules/installedapp/RelatedApplication.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.
 
 // TODO(mgiuca): Link to full spec, rather than explainer, upon completion.
 // https://github.com/WICG/get-installed-related-apps/blob/master/EXPLAINER.md
 
 // TODO(mgiuca): This should be a dictionary, not an interface.
 // (NoInterfaceObject is basically a makeshift dictionary.)
 // https://crbug.com/687444.
 [
     NoInterfaceObject,
-    RuntimeEnabled=InstalledApp
+    OriginTrialEnabled=InstalledApp
 ] interface RelatedApplication {
     readonly attribute DOMString platform;
     readonly attribute DOMString url;
     readonly attribute DOMString id;
 };