DevTools: Make snippets renaming work through SnippetsProjectDelegate.

Source/devtools/front_end/FileSystemProjectDelegate.js

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 112 matching lines @@
      * @param {string} newContent
      * @param {function(?string)} callback
      */
     setFileContent: function(path, newContent, callback)
     {
         var filePath = this._filePathForPath(path);
         this._fileSystem.setFileContent(filePath, newContent, callback.bind(this, ""));
     },
 
     /**
+     * @return {boolean}
+     */
+    canRename: function()
+    {
+        return false;
+    },
+
+    /**
+     * @param {Array.<string>} path
+     * @param {string} newName
+     * @param {function(boolean, string=)} callback
+     */
+    rename: function(path, newName, callback)
+    {
+        callback(false);
+    },
+
+    /**
      * @param {Array.<string>} path
      * @param {string} query
      * @param {boolean} caseSensitive
      * @param {boolean} isRegex
      * @param {function(Array.<WebInspector.ContentProvider.SearchMatch>)} callback
      */
     searchInFileContent: function(path, query, caseSensitive, isRegex, callback)
     {
         var filePath = this._filePathForPath(path);
         this._fileSystem.requestFileContent(filePath, contentCallback.bind(this));
@@ skipping 124 matching lines @@
     {
         var projectDelegate = this._simpleProjectDelegates[uiSourceCode.project().id()];
         return projectDelegate.fileSystemPath();
     }
 }
 
 /**
  * @type {?WebInspector.FileSystemWorkspaceProvider}
  */
 WebInspector.fileSystemWorkspaceProvider = null;