Revert 177182 - ViewTest.ChangeNativeViewHierarchyFindRoots failure

chrome/browser/ui/ash/chrome_shell_delegate.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate.cc
===================================================================
--- chrome/browser/ui/ash/chrome_shell_delegate.cc	(revision 177189)
+++ chrome/browser/ui/ash/chrome_shell_delegate.cc	(working copy)
@@ -8,6 +8,7 @@
 #include "ash/launcher/launcher_types.h"
 #include "ash/magnifier/magnifier_constants.h"
 #include "ash/system/tray/system_tray_delegate.h"
+#include "ash/wm/stacking_controller.h"
 #include "ash/wm/window_util.h"
 #include "base/bind.h"
 #include "base/command_line.h"
@@ -556,6 +557,10 @@
   return new LauncherContextMenu(launcher_delegate_, root);
 }
 
+aura::client::StackingClient* ChromeShellDelegate::CreateStackingClient() {
+  return new ash::StackingController;
+}
+
 ash::RootWindowHostFactory* ChromeShellDelegate::CreateRootWindowHostFactory() {
   return ash::RootWindowHostFactory::Create();
 }