Change Window visibility to a simple boolean for now.

ui/aura/demo/demo_main.cc

Index: ui/aura/demo/demo_main.cc
===================================================================
--- ui/aura/demo/demo_main.cc	(revision 103502)
+++ ui/aura/demo/demo_main.cc	(working copy)
@@ -87,7 +87,7 @@
   window1.set_id(1);
   window1.Init();
   window1.SetBounds(gfx::Rect(100, 100, 400, 400));
-  window1.SetVisibility(aura::Window::VISIBILITY_SHOWN);
+  window1.Show();
   window1.SetParent(NULL);
 
   DemoWindowDelegate window_delegate2(SK_ColorRED);
@@ -95,7 +95,7 @@
   window2.set_id(2);
   window2.Init();
   window2.SetBounds(gfx::Rect(200, 200, 350, 350));
-  window2.SetVisibility(aura::Window::VISIBILITY_SHOWN);
+  window2.Show();
   window2.SetParent(NULL);
 
   DemoWindowDelegate window_delegate3(SK_ColorGREEN);
@@ -103,7 +103,7 @@
   window3.set_id(3);
   window3.Init();
   window3.SetBounds(gfx::Rect(10, 10, 50, 50));
-  window3.SetVisibility(aura::Window::VISIBILITY_SHOWN);
+  window3.Show();
   window3.SetParent(&window2);
 
   aura::Desktop::GetInstance()->Run();