media: Adding test file for Opus in Ogg

Adding a test file for Opus in ogg container. Also removing an
unused test file.

BUG=104241,178309,315165
R=acolwell@chromium.org

Review URL: https://codereview.chromium.org/75963004

Patch from vignesh <vigneshv@chromium.org>.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237124 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237124