[FastTextAutosizing] Remove old virtual test expectations

This patch cleans up the virtual expectations after [1] removed the
tests.

[1] https://src.chromium.org/viewvc/blink?view=rev&revision=172846

BUG=367493

Review URL: https://codereview.chromium.org/265723002

git-svn-id: svn://svn.chromium.org/blink/trunk@173134 bbb929c8-8fbe-4397-9dbb-9b2b20218538