We use hashing to map all variables/strcuture field names, etc,
so we no longer need this option.

Checked with Firefox and WebKit, they no longer use this option
either. Time to remove it.

Change-Id: Ie3e79b91a05258b04af419a9c42b2fd1b00e67c4
Reviewed-on: https://chromium-review.googlesource.com/189236Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Zhenyao Mo <zmo@chromium.org>