Sync the logging in HTMLMediaElement::scheduleDelayedAction with reality

The method was renamed in r145322, but not the log message.

BUG=none
NOTRY=true

Review URL: https://codereview.chromium.org/52593010

git-svn-id: svn://svn.chromium.org/blink/trunk@161045 bbb929c8-8fbe-4397-9dbb-9b2b20218538