GitLab

Rename existing release() method to close(), and add remove().

BUG=358271
TEST=updated EME tests pass

Review URL: https://codereview.chromium.org/568033003

git-svn-id: svn://svn.chromium.org/blink/trunk@183689 bbb929c8-8fbe-4397-9dbb-9b2b20218538