Move the concept of Activation to the Shell.

ui/aura/test/test_stacking_client.cc

Index: ui/aura/test/test_stacking_client.cc
===================================================================
--- ui/aura/test/test_stacking_client.cc	(revision 114022)
+++ ui/aura/test/test_stacking_client.cc	(working copy)
@@ -26,20 +26,5 @@
   default_container_->AddChild(window);
 }
 
-bool TestStackingClient::CanActivateWindow(Window* window) const {
-  return window->parent() == default_container_;
-}
-
-Window* TestStackingClient::GetTopmostWindowToActivate(Window* ignore) const {
-  for (aura::Window::Windows::const_reverse_iterator i =
-           default_container_->children().rbegin();
-       i != default_container_->children().rend();
-       ++i) {
-    if (*i != ignore && (*i)->CanActivate())
-      return *i;
-  }
-  return NULL;
-}
-
 }  // namespace test
 }  // namespace aura