Fix the content_browsertests everywhere maybe.

ash/test/test_shell_delegate.cc

Index: ash/test/test_shell_delegate.cc
diff --git a/ash/test/test_shell_delegate.cc b/ash/test/test_shell_delegate.cc
index c2fdc603ad88b397240951a6c28c510f30204a2c..46901561d1621dfdd0d05ddcc66545596c838c7d 100644
--- a/ash/test/test_shell_delegate.cc
+++ b/ash/test/test_shell_delegate.cc
@@ -11,7 +11,6 @@
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/test/test_launcher_delegate.h"
-#include "ash/wm/stacking_controller.h"
 #include "ash/wm/window_util.h"
 #include "content/public/test/test_browser_context.h"
 #include "ui/aura/window.h"
@@ -204,10 +203,6 @@ double TestShellDelegate::GetSavedScreenMagnifierScale() {
   return std::numeric_limits<double>::min();
 }
 
-aura::client::StackingClient* TestShellDelegate::CreateStackingClient() {
-  return new StackingController;
-}
-
 RootWindowHostFactory* TestShellDelegate::CreateRootWindowHostFactory() {
   return RootWindowHostFactory::Create();
 }