DevTools: Make snippets renaming work through SnippetsProjectDelegate.

Source/devtools/front_end/FileSystemProjectDelegate.js

Index: Source/devtools/front_end/FileSystemProjectDelegate.js
diff --git a/Source/devtools/front_end/FileSystemProjectDelegate.js b/Source/devtools/front_end/FileSystemProjectDelegate.js
index 9c2cc28ae2cd5aa64eff2d68fb185fcc27d15cd1..9ddecdb3f6ce3025aafbdc398e8a8043809043c3 100644
--- a/Source/devtools/front_end/FileSystemProjectDelegate.js
+++ b/Source/devtools/front_end/FileSystemProjectDelegate.js
@@ -130,6 +130,24 @@ WebInspector.FileSystemProjectDelegate.prototype = {
     },
 
     /**
+     * @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