[DevTools] Enable deleting of a snippet by pressing delete key

Source/devtools/front_end/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 166 matching lines @@
     _sourceSelected: function(uiSourceCode, focusSource)
     {
         this._lastSelectedUISourceCode = uiSourceCode;
         var data = { uiSourceCode: uiSourceCode, focusSource: focusSource};
         this.dispatchEventToListeners(WebInspector.NavigatorView.Events.ItemSelected, data);
     },
 
     /**
      * @param {WebInspector.UISourceCode} uiSourceCode
      */
+    sourceDeleted: function(uiSourceCode)
+    {
+    },
+
+    /**
+     * @param {WebInspector.UISourceCode} uiSourceCode
+     */
     removeUISourceCode: function(uiSourceCode)
     {
         var node = this._uiSourceCodeNodes.get(uiSourceCode);
         if (!node)
             return;
 
         var projectNode = this._projectNode(uiSourceCode.project());
         var subfolderNodes = this._subfolderNodes.get(projectNode);
         var parentNode = node.parent;
         this._uiSourceCodeNodes.remove(uiSourceCode);
@@ skipping 472 matching lines @@
         var middleClick = event.button === 1;
         this._navigatorView._sourceSelected(this.uiSourceCode, !middleClick);
     },
 
     onenter: function()
     {
         this._navigatorView._sourceSelected(this.uiSourceCode, true);
         return true;
     },
 
+    ondelete: function()
+    {
+        this._navigatorView.sourceDeleted(this.uiSourceCode);
+        return true;
+    },
+
     /**
      * @param {Event} event
      */
     _handleContextMenuEvent: function(event)
     {
         this.select();
         this._navigatorView.handleFileContextMenu(event, this._uiSourceCode);
     },
 
     __proto__: WebInspector.BaseNavigatorTreeElement.prototype
@@ skipping 461 matching lines @@
 
     willRemoveChild: function(node)
     {
         if (node._isMerged || !this.isPopulated())
             return;
         this._treeElement.removeChild(node._treeElement);
     },
 
     __proto__: WebInspector.NavigatorTreeNode.prototype
 }