Change Window visibility to a simple boolean for now.

ui/aura/desktop.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/aura/desktop.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "ui/aura/desktop_host.h"
 #include "ui/aura/focus_manager.h"
@@ skipping 39 matching lines @@
 
 void Desktop::Init() {
   window_->Init();
   compositor()->SetRootLayer(window_->layer());
 }
 
 void Desktop::CreateDefaultParentForTesting() {
   Window* default_parent = new internal::ToplevelWindowContainer;
   default_parent->Init();
   default_parent->SetBounds(window_->bounds());
-  default_parent->SetVisibility(Window::VISIBILITY_SHOWN);
+  default_parent->Show();
   window_->AddChild(default_parent);
   set_default_parent(default_parent);
 }
 
 void Desktop::Show() {
   host_->Show();
 }
 
 void Desktop::SetSize(const gfx::Size& size) {
   host_->SetSize(size);
@@ skipping 58 matching lines @@
   // Reset active_window_ before invoking SetActiveWindow so that we don't
   // attempt to notify it while running its destructor.
   active_window_ = NULL;
   SetActiveWindow(GetTopmostWindowToActivate(window), NULL);
 }
 
 Window* Desktop::GetTopmostWindowToActivate(Window* ignore) {
   Window::Windows windows(default_parent_->children());
   for (Window::Windows::const_reverse_iterator i = windows.rbegin();
        i != windows.rend(); ++i) {
-    if (*i != ignore && (*i)->visibility() == Window::VISIBILITY_SHOWN &&
+    if (*i != ignore && (*i)->visible() &&
         (*i)->delegate()->ShouldActivate(NULL))
       return *i;
   }
   return NULL;
 }
 
 // static
 Desktop* Desktop::GetInstance() {
   if (!instance_) {
     instance_ = new Desktop;
     instance_->Init();
   }
   return instance_;
 }
 
 }  // namespace aura