w3c deps roll for layout tests: update the list of directories to import 

This is patch 1 of 6 in the roll.

TBR=phoglund@chromium.org
NOTRY=1
BUG=404022

Review URL: https://codereview.chromium.org/475313002

git-svn-id: svn://svn.chromium.org/blink/trunk@180324 bbb929c8-8fbe-4397-9dbb-9b2b20218538