Sync some media/track test expectations.
Sync some media/track test expectations.

Remove entries that were asserting prior to crbug.com/521520 being fixed.

R=haraken,keishi
BUG=521102,521861
NOTRY=true

Review URL: https://codereview.chromium.org/1311733002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@201051 bbb929c8-8fbe-4397-9dbb-9b2b20218538

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk