Get rid of KeepAlive. Quit shell when all urls run directly by Context are closed.

mojo/public/cpp/application/application_impl.h

Index: mojo/public/cpp/application/application_impl.h
diff --git a/mojo/public/cpp/application/application_impl.h b/mojo/public/cpp/application/application_impl.h
index e16299fa6d291b708a11afb791ff77bc70fc62fe..e4d53c4ef35033a63ec20af1a3e27ee0d7646d75 100644
--- a/mojo/public/cpp/application/application_impl.h
+++ b/mojo/public/cpp/application/application_impl.h
@@ -82,7 +82,10 @@ class ApplicationImpl : public InterfaceImpl<Application> {
 
   void BindShell(ScopedMessagePipeHandle shell_handle);
   void ClearConnections();
-  void OnShellError() { ClearConnections(); Terminate(); };
+  void OnShellError() {
+    ClearConnections();
+    Terminate();
+  };
 
   // Quits the main run loop for this application.
   static void Terminate();