Enable/add baseline for fast/encoding/utf-16-odd-byte.html

This test was added to cover the case where a file encoded with UTF-16
has a stray byte at the end. Encoding Standard says to emit U+FFFD,
but Blink silently consumes the byte, as do other browsers - but for
completely different reasons. Fix under discussion, but in the
meantime we should have a baseline for the current behavior.

TBR=jshin@chromium.org
BUG=277034

Review URL: https://codereview.chromium.org/27235007

git-svn-id: svn://svn.chromium.org/blink/trunk@159682 bbb929c8-8fbe-4397-9dbb-9b2b20218538