Convert TrayEventFilter to wm common types

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 6d1d47b03426cfad3397df4e05807424d4aea258..ad478a85e1ccda0eee63a15b3c620d52ed499738 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -11,7 +11,6 @@
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/tray/default_system_tray_delegate.h"
 #include "ash/common/wm/window_state.h"
-#include "ash/container_delegate_aura.h"
 #include "ash/default_user_wallpaper_delegate.h"
 #include "ash/gpu_support_stub.h"
 #include "ash/media_delegate.h"
@@ -257,11 +256,6 @@ ash::MediaDelegate* ShellDelegateImpl::CreateMediaDelegate() {
   return new MediaDelegateImpl;
 }
 
-std::unique_ptr<ash::ContainerDelegate>
-ShellDelegateImpl::CreateContainerDelegate() {
-  return base::WrapUnique(new ContainerDelegateAura);
-}
-
 std::unique_ptr<ash::PointerWatcherDelegate>
 ShellDelegateImpl::CreatePointerWatcherDelegate() {
   return base::WrapUnique(new PointerWatcherDelegateAura);