Don't use base::MessageLoop::{Quit,QuitClosure} in media/

This patch renames base::MessageLoop::{Quit,QuitClosure} to
base::MessageLoop::{QuitWhenIdle,QuitWhenIdleClosure}.

BUG=131220
R=ddorwin@chromium.org

Review URL: https://codereview.chromium.org/1396113004

Cr-Commit-Position: refs/heads/master@{#353600}
12 files changed