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

mash/task_viewer/task_viewer.cc

Index: mash/task_viewer/task_viewer.cc
diff --git a/mash/task_viewer/task_viewer.cc b/mash/task_viewer/task_viewer.cc
index 8e481365af80373ff32dddfcb01a4b575bee01d8..705d57d63c75a97b77c9c1c39848a2f4b8b3b7ef 100644
--- a/mash/task_viewer/task_viewer.cc
+++ b/mash/task_viewer/task_viewer.cc
@@ -290,7 +290,7 @@ void TaskViewer::Initialize(shell::Connector* connector,
   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 TaskViewer::AcceptConnection(shell::Connection* connection) {