[escher] Delete childless view and implement it as default view

Change-Id: I545c8270fc8235ee578b2237361df50c919d0b61

escher/src/stack_view.cpp

@@ -4,7 +4,7 @@ extern "C" {
 }
 
 StackView::StackView() :
-  ChildlessView(),
+  View(),
   m_name(nullptr)
 {
 }