libFiles does nothing in fourslash tests

Author: jakebailey

tests/cases/fourslash/moveToNewFile_moveJsxImport1.ts

@@ -1,7 +1,6 @@
 /// <reference path='fourslash.ts' />
 
 // @jsx: preserve
-// @libFiles: react.d.ts
 
 // @Filename: file.tsx
 //// import React = require('react');

tests/cases/fourslash/moveToNewFile_moveJsxImport2.ts

@@ -1,7 +1,6 @@
 /// <reference path='fourslash.ts' />
 
 // @jsx: preserve
-// @libFiles: react.d.ts
 
 // @Filename: file.tsx
 //// import React = require('react');

tests/cases/fourslash/moveToNewFile_moveJsxImport3.ts

@@ -1,7 +1,6 @@
 /// <reference path='fourslash.ts' />
 
 // @jsx: preserve
-// @libFiles: react.d.ts
 
 // @Filename: file.tsx
 //// import React = require('react');

tests/cases/fourslash/moveToNewFile_moveJsxImport4.ts

@@ -1,7 +1,6 @@
 /// <reference path='fourslash.ts' />
 
 // @jsx: preserve
-// @libFiles: react.d.ts
 
 // @Filename: file.tsx
 //// import React = require('leftpad');

tests/cases/fourslash/tsxSignatureHelp1.ts

@@ -1,9 +1,8 @@
 /// <reference path='fourslash.ts' />
 
-//@Filename: file.tsx
 // @jsx: preserve
-// @libFiles: react.d.ts
 
+//@Filename: file.tsx
 //// import React = require('react');
 //// export interface ClickableProps {
 ////     children?: string;

tests/cases/fourslash/tsxSignatureHelp2.ts

@@ -1,9 +1,8 @@
 /// <reference path='fourslash.ts' />
 
-//@Filename: file.tsx
 // @jsx: preserve
-// @libFiles: react.d.ts
 
+//@Filename: file.tsx
 //// import React = require('react');
 //// export interface ClickableProps {
 ////     children?: string;