Delete unused files

These files do not appear to be referenced in the build and can therefore be
deleted.

R=adamk@chromium.org

Review URL: https://codereview.chromium.org/199793020

git-svn-id: svn://svn.chromium.org/blink/trunk@169867 bbb929c8-8fbe-4397-9dbb-9b2b20218538