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

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

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

Review URL: https://codereview.chromium.org/1398973003

Cr-Commit-Position: refs/heads/master@{#353372}
27 files changed