child_process: add .stdin stream to forks

Remove test as it doesn't make any sense after the latest stdio API
changes.

lib/child_process.js

@@ -437,7 +437,8 @@ exports.fork = function(modulePath /*, args, options*/) {
 
   // Leave stdin open for the IPC channel. stdout and stderr should be the
   // same as the parent's if silent isn't set.
-  options.stdio = options.silent ? ['ipc', 'pipe', 'pipe'] : ['ipc', 1, 2];
+  options.stdio = options.silent ? ['pipe', 'pipe', 'pipe', 'ipc'] :
+      [0, 1, 2, 'ipc'];
 
   return spawn(process.execPath, args, options);
 };

test/simple/test-child-process-fork3.js

@@ -1,32 +0,0 @@
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-var common = require('../common');
-var assert = require('assert');
-var fork = require('child_process').fork;
-
-var filename = common.fixturesDir + '/destroy-stdin.js';
-
-// Ensure that we don't accidentally close fd 0 and
-// reuse it for something else, it causes all kinds
-// of obscure bugs.
-process.stdin.destroy();
-fork(filename).stdin.on('end', process.exit);