Fix the content_browsertests everywhere maybe.

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index 681dfb5ed14c3f969abfdced8e7408fcc35a42e1..945fae91ec4acd108eae8e3e138f9e76984bb6e1 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -11,7 +11,6 @@
 #include "ash/shell/context_menu.h"
 #include "ash/shell/toplevel_window.h"
 #include "ash/shell_window_ids.h"
-#include "ash/wm/stacking_controller.h"
 #include "ash/wm/window_util.h"
 #include "base/message_loop.h"
 #include "ui/aura/window.h"
@@ -215,10 +214,6 @@ ui::MenuModel* ShellDelegateImpl::CreateContextMenu(aura::RootWindow* root) {
   return new ContextMenu(root);
 }
 
-aura::client::StackingClient* ShellDelegateImpl::CreateStackingClient() {
-  return new StackingController;
-}
-
 RootWindowHostFactory* ShellDelegateImpl::CreateRootWindowHostFactory() {
   return RootWindowHostFactory::Create();
 }