test: remove obsolete TODO comments

The readfile/pipe tests rely on pre-existing pipes in the system.
This arguably tests the OS functionality and not really io.js
functionality. Removing TODOs.

PR-URL: #2033
Reviewed-By: Trevor Norris <trev.norris@gmail.com>

Author: Trott

test/parallel/test-fs-readfile-pipe-large.js

@@ -5,7 +5,6 @@ var path = require('path');
 
 // simulate `cat readfile.js | node readfile.js`
 
-// TODO: Have some way to make this work on windows.
 if (process.platform === 'win32') {
   console.error('No /dev/stdin on windows.  Skipping test.');
   process.exit();

test/parallel/test-fs-readfile-pipe.js

@@ -4,7 +4,6 @@ var assert = require('assert');
 
 // simulate `cat readfile.js | node readfile.js`
 
-// TODO: Have some way to make this work on windows.
 if (process.platform === 'win32') {
   console.error('No /dev/stdin on windows.  Skipping test.');
   process.exit();

test/parallel/test-fs-readfilesync-pipe-large.js

@@ -5,7 +5,6 @@ var path = require('path');
 
 // simulate `cat readfile.js | node readfile.js`
 
-// TODO: Have some way to make this work on windows.
 if (process.platform === 'win32') {
   console.error('No /dev/stdin on windows.  Skipping test.');
   process.exit();