Move WebInbandTextTrack/WebInbandTextTrackClient to public/platform/

This is to allow InbandTextTrackPrivate/InbandTextTrackPrivateClient
to be removed, by using the Web* variants directly, and for that to
be allowed they must reside in public/platform/.

Some style changes were required to please presubmit.

BUG=316172

Review URL: https://codereview.chromium.org/61763010

git-svn-id: svn://svn.chromium.org/blink/trunk@161626 bbb929c8-8fbe-4397-9dbb-9b2b20218538
4 files changed
tree: 6e63a253e102e2fbcddeca7af85af3d58e27c78c
  1. third_party/