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

mojo/runner/context.cc

Index: mojo/runner/context.cc
diff --git a/mojo/runner/context.cc b/mojo/runner/context.cc
index f1bb1a468ae26b4b75343822f6a8611587f439c8..462ed84d350d8435d09a0253a0e98ab58fcf7bbe 100644
--- a/mojo/runner/context.cc
+++ b/mojo/runner/context.cc
@@ -259,7 +259,7 @@ void Context::Shutdown() {
 void Context::OnShutdownComplete() {
   DCHECK_EQ(base::MessageLoop::current()->task_runner(),
             task_runners_->shell_runner());
-  base::MessageLoop::current()->Quit();
+  base::MessageLoop::current()->QuitWhenIdle();
 }
 
 void Context::Run(const GURL& url) {
@@ -302,7 +302,7 @@ void Context::OnApplicationEnd(const GURL& url) {
       DCHECK_EQ(base::MessageLoop::current()->task_runner(),
                 task_runners_->shell_runner());
       if (app_complete_callback_.is_null()) {
-        base::MessageLoop::current()->Quit();
+        base::MessageLoop::current()->QuitWhenIdle();
       } else {
         app_complete_callback_.Run();
       }