Remove failing expectations for tests fixed by r175434

The change to no longer pixel snap for ellipsis (r175434) fixed two ref
tests failures on Win7 with DirectWrite. Remove the failing expectation
for those tests accordingly.

TBR=leviw@chromium.org
BUG=378489

Review URL: https://codereview.chromium.org/311153002

git-svn-id: svn://svn.chromium.org/blink/trunk@175500 bbb929c8-8fbe-4397-9dbb-9b2b20218538