w3c deps roll for layout tests: remove unneeded upstream expectations

The expectation lines have been moved to test_expectations_w3c.txt, so
they are safe to delete from TestExpectations.

This is patch 3 of 6 in the roll.

TBR=phoglund@chromium.org
BUG=404022

Review URL: https://codereview.chromium.org/477043002

git-svn-id: svn://svn.chromium.org/blink/trunk@180375 bbb929c8-8fbe-4397-9dbb-9b2b20218538