ApplicationImpl cleanup, part 1:

mojo/application/public/cpp/lib/application_runner.cc

Index: mojo/application/public/cpp/lib/application_runner.cc
diff --git a/mojo/application/public/cpp/lib/application_runner.cc b/mojo/application/public/cpp/lib/application_runner.cc
index 0418d91b47a45c490c8e4adef6db57eee56df09b..2383b7e72f5c89fb8c2865ab6a680382a715cc26 100644
--- a/mojo/application/public/cpp/lib/application_runner.cc
+++ b/mojo/application/public/cpp/lib/application_runner.cc
@@ -60,7 +60,8 @@ MojoResult ApplicationRunner::Run(MojoHandle application_request_handle,
 
     ApplicationImpl impl(delegate_.get(),
                          MakeRequest<Application>(MakeScopedHandle(
-                             MessagePipeHandle(application_request_handle))));
+                             MessagePipeHandle(application_request_handle))),
+                         base::MessageLoop::QuitWhenIdleClosure());
     loop->Run();
     // It's very common for the delegate to cache the app and terminate on
     // errors. If we don't delete the delegate before the app we run the risk