Remove unused resources that tested window.history cross-origin access.

The tests that used these resources were removed in
http://crrev.com/14198015.

BUG=237080

Review URL: https://codereview.chromium.org/497683002

git-svn-id: svn://svn.chromium.org/blink/trunk@180762 bbb929c8-8fbe-4397-9dbb-9b2b20218538