function fileSystemLoaded(fs)
        {
            domFileSystem = /** @type {!DOMFileSystem} */ (fs);
            console.assert(domFileSystem);
            ++pendingRequests;
            this._requestEntries(domFileSystem, path, innerCallback.bind(this));
        }
@param {?DOMFileSystem} fs
@this {WebInspector.IsolatedFileSystem}