DevTools: Remove unused variables. Disallow unused variables with eslint

third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js

 /*
  * Copyright (C) 2009, 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 1781 matching lines @@
   }
 
   markUndoableState() {
     this._agent.markUndoableState();
   }
 
   /**
    * @param {function(?Protocol.Error)=} callback
    */
   undo(callback) {
-    /**
-     * @param {?Protocol.Error} error
-     * @this {SDK.DOMModel}
-     */
-    function mycallback(error) {
-      this.dispatchEventToListeners(SDK.DOMModel.Events.UndoRedoCompleted);
-      callback(error);
-    }
-
-    this.dispatchEventToListeners(SDK.DOMModel.Events.UndoRedoRequested);

[einbinder, 2016/12/10 00:47:37]

Nothing even uses these events.

     this._agent.undo(callback);
   }
 
   /**
    * @param {function(?Protocol.Error)=} callback
    */
   redo(callback) {
-    /**
-     * @param {?Protocol.Error} error
-     * @this {SDK.DOMModel}
-     */
-    function mycallback(error) {
-      this.dispatchEventToListeners(SDK.DOMModel.Events.UndoRedoCompleted);
-      callback(error);
-    }
-
-    this.dispatchEventToListeners(SDK.DOMModel.Events.UndoRedoRequested);
     this._agent.redo(callback);
   }
 
   /**
    * @param {?SDK.DOMNodeHighlighter} highlighter
    */
   setHighlighter(highlighter) {
     this._highlighter = highlighter || this._defaultHighlighter;
   }
 
@@ skipping 323 matching lines @@
   /**
    * @override
    * @param {!Protocol.Page.FrameId} frameId
    */
   highlightFrame(frameId) {
     this._agent.highlightFrame(
         frameId, Common.Color.PageHighlight.Content.toProtocolRGBA(),
         Common.Color.PageHighlight.ContentOutline.toProtocolRGBA());
   }
 };