Remove unused InvalidateOnItemAttrChange NodeList invalidation type

Remove unused InvalidateOnItemAttrChange NodeList invalidation type.
There is no code using it anymore and causes unnecessary code
generation / checks.

R=adamk, abarth

Review URL: https://codereview.chromium.org/158483002

git-svn-id: svn://svn.chromium.org/blink/trunk@166784 bbb929c8-8fbe-4397-9dbb-9b2b20218538