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

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

BUG=131220
TEST=
R=joedow@chromium.org

Review URL: https://codereview.chromium.org/1394803004

Cr-Commit-Position: refs/heads/master@{#353583}
21 files changed