Rebaseline fast/dom/HTMLProgressElement/progress-element.html

Chromium CL https://chromiumcodereview.appspot.com/19682002 changed the
expected rendering for progress elements

TBR=zturner@chromium.org
BUG=176221

Review URL: https://codereview.chromium.org/19875004

git-svn-id: svn://svn.chromium.org/blink/trunk@154692 bbb929c8-8fbe-4397-9dbb-9b2b20218538