DevTools: Fix url assignment when renaming files in workspace

LayoutTests/http/tests/inspector/isolated-filesystem-test.js

 var initialize_IsolatedFileSystemTest = function() {
 
 InspectorTest.createIsolatedFileSystemManager = function(workspace, fileSystemMapping)
 {
     var manager = new MockIsolatedFileSystemManager();
     manager.fileSystemWorkspaceBinding = new WebInspector.FileSystemWorkspaceBinding(manager, workspace);
     manager.fileSystemMapping = fileSystemMapping;
     return manager;
 }
 
@@ skipping 39 matching lines @@
     },
 
     requestFilesRecursive: function(path, callback)
     {
         this._callback = callback;
         if (!this._files)
             return;
         this._innerRequestFilesRecursive();
     },
 
+    renameFile: function(filePath, newName, callback)
+    {
+        callback(true, newName);
+    },
+
     _innerRequestFilesRecursive: function()
     {
         if (!this._callback)
             return;
         var files = Object.keys(this._files);
         for (var i = 0; i < files.length; ++i) {
             var isExcluded = false;
             for (var j = 0; j < files[i].length; ++j) {
                 if (files[i][j] === "/") {
                     if (this._manager.mapping().isFileExcluded(this._path, files[i].substr(0, j + 1)))
@@ skipping 62 matching lines @@
     WebInspector.isolatedFileSystemManager._onFileSystemAdded({data: {fileSystem: fileSystem}});
     return MockIsolatedFileSystem._isolatedFileSystemMocks[path];
 }
 
 InspectorTest.addFilesToMockFileSystem = function(path, files)
 {
     MockIsolatedFileSystem._isolatedFileSystemMocks[path]._addFiles(files);
 }
 
 };