Remove unused show/hideTextTrackDisplay()

BUG=448795

Review URL: https://codereview.chromium.org/951253002

git-svn-id: svn://svn.chromium.org/blink/trunk@190733 bbb929c8-8fbe-4397-9dbb-9b2b20218538
2 files changed
tree: 45beb90946f8972d24bd2a7998589280bcf5a1ab
  1. third_party/