views/mus: Have explicit ownership of views::WindowManagerConnection.

mash/example/views_examples/views_examples_application_delegate.cc

Index: mash/example/views_examples/views_examples_application_delegate.cc
diff --git a/mash/example/views_examples/views_examples_application_delegate.cc b/mash/example/views_examples/views_examples_application_delegate.cc
index f990eb101153b58861909ea2924ebffdb7bd0d8d..268ccc38e0231d02404761deaf3200de37d67a63 100644
--- a/mash/example/views_examples/views_examples_application_delegate.cc
+++ b/mash/example/views_examples/views_examples_application_delegate.cc
@@ -22,7 +22,7 @@ void ViewsExamplesApplicationDelegate::Initialize(
     uint32_t id) {
   tracing_.Initialize(connector, identity.name());
   aura_init_.reset(new views::AuraInit(connector, "views_mus_resources.pak"));
-  views::WindowManagerConnection::Create(connector, identity);
+  views_mus_ = views::WindowManagerConnection::Create(connector, identity);
 }
 
 bool ViewsExamplesApplicationDelegate::AcceptConnection(