Update acid3 test.

The test has been updated upstream to remove the removeNamedItemNS
test since the DOM spec removes this feature.

Review URL: https://codereview.chromium.org/112273002

git-svn-id: svn://svn.chromium.org/blink/trunk@163995 bbb929c8-8fbe-4397-9dbb-9b2b20218538