DevTools: Remove unused variables. Disallow unused variables with eslint

third_party/WebKit/Source/devtools/front_end/sources/NavigatorView.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 139 matching lines @@
 
   /**
    * @param {!TreeElement} treeElement1
    * @param {!TreeElement} treeElement2
    * @return {number}
    */
   static _treeElementsCompare(treeElement1, treeElement2) {
     var typeWeight1 = Sources.NavigatorView._treeElementOrder(treeElement1);
     var typeWeight2 = Sources.NavigatorView._treeElementOrder(treeElement2);
 
-    var result;
     if (typeWeight1 > typeWeight2)
       return 1;
     if (typeWeight1 < typeWeight2)
       return -1;
     return treeElement1.titleAsText().compareTo(treeElement2.titleAsText());
   }
 
   /**
    * @param {!Common.Event} event
    */
@@ skipping 512 matching lines @@
       this._sourceSelected(uiSourceCode, true);
     }
   }
 
   /**
    * @param {!Workspace.Project} project
    * @param {string} path
    * @param {!Workspace.UISourceCode=} uiSourceCodeToCopy
    */
   create(project, path, uiSourceCodeToCopy) {
-    var filePath;
-    var uiSourceCode;
-
     /**
      * @this {Sources.NavigatorView}
      * @param {?string} content
      */
     function contentLoaded(content) {
       createFile.call(this, content || '');
     }
 
     if (uiSourceCodeToCopy)
       uiSourceCodeToCopy.requestContent().then(contentLoaded.bind(this));
@@ skipping 888 matching lines @@
   /**
    * @param {string} title
    * @override
    */
   setTitle(title) {
     this._title = title;
     if (this._treeElement)
       this._treeElement.title = this._title;
   }
 };