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 1789 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);
     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 87 matching lines @@
   AttrModified: Symbol('AttrModified'),
   AttrRemoved: Symbol('AttrRemoved'),
   CharacterDataModified: Symbol('CharacterDataModified'),
   DOMMutated: Symbol('DOMMutated'),
   NodeInserted: Symbol('NodeInserted'),
   NodeInspected: Symbol('NodeInspected'),
   NodeHighlightedInOverlay: Symbol('NodeHighlightedInOverlay'),
   NodeRemoved: Symbol('NodeRemoved'),
   DocumentUpdated: Symbol('DocumentUpdated'),
   ChildNodeCountUpdated: Symbol('ChildNodeCountUpdated'),
-  UndoRedoRequested: Symbol('UndoRedoRequested'),
-  UndoRedoCompleted: Symbol('UndoRedoCompleted'),
   DistributedNodesChanged: Symbol('DistributedNodesChanged'),
-  ModelSuspended: Symbol('ModelSuspended'),
   InspectModeWillBeToggled: Symbol('InspectModeWillBeToggled'),
   MarkersChanged: Symbol('MarkersChanged')
 };
 
 
 /**
  * @implements {Protocol.DOMDispatcher}
  * @unrestricted
  */
 SDK.DOMDispatcher = class {
@@ skipping 212 matching lines @@
   /**
    * @override
    * @param {!Protocol.Page.FrameId} frameId
    */
   highlightFrame(frameId) {
     this._agent.highlightFrame(
         frameId, Common.Color.PageHighlight.Content.toProtocolRGBA(),
         Common.Color.PageHighlight.ContentOutline.toProtocolRGBA());
   }
 };