tty: Remove deprecated setRawMode wrapper

PR-URL: #2528
Reviewed-By: Brian White <mscdex@mscdex.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/tty.markdown

@@ -65,8 +65,4 @@ gets updated on "resize" events.
 Returns `true` or `false` depending on if the `fd` is associated with a
 terminal.
 
-## tty.setRawMode(mode)
-
-    Stability: 0 - Deprecated: Use [tty.ReadStream#setRawMode][] (i.e. process.stdin.setRawMode) instead.
-
 [tty.ReadStream#setRawMode]: #tty_rs_setrawmode_mode

lib/tty.js

@@ -14,16 +14,6 @@ exports.isatty = function(fd) {
 };
 
 
-// backwards-compat
-exports.setRawMode = internalUtil.deprecate(function(flag) {
-  if (!process.stdin.isTTY) {
-    throw new Error('Can\'t set raw mode on non-tty');
-  }
-  process.stdin.setRawMode(flag);
-}, 'tty.setRawMode is deprecated. ' +
-   'Use process.stdin.setRawMode instead.');
-
-
 function ReadStream(fd, options) {
   if (!(this instanceof ReadStream))
     return new ReadStream(fd, options);