Clean up ReaderMode OverlayPanel classes

components/dom_distiller/content/common/distiller_javascript_service.mojom

 // Copyright 2015 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.
 
 module dom_distiller.mojom;
 
 // This service is implemented by the browser process and is used by the
 // renderer when a distiller JavaScript function is called.
 interface DistillerJavaScriptService {
-  // Handle closing the overlay panel that contains Reader Mode; the
-  // "distiller.close" function.
-  HandleDistillerClosePanelCall(bool animate);
-
   // Open the Android view containing settings for Reader Mode; the
   // "distiller.openSettings" function.
   HandleDistillerOpenSettingsCall();
 };