ui: Cleanup class/struct forward declarations

ash/common/test/test_shelf_item_delegate.cc

Index: ash/common/test/test_shelf_item_delegate.cc
diff --git a/ash/common/test/test_shelf_item_delegate.cc b/ash/common/test/test_shelf_item_delegate.cc
index 6983a1edf91e1fa92041498d1ca2f63817fe9b7f..96916d677e071fa598307e4d01be04f208a63b09 100644
--- a/ash/common/test/test_shelf_item_delegate.cc
+++ b/ash/common/test/test_shelf_item_delegate.cc
@@ -4,11 +4,34 @@
 
 #include "ash/common/test/test_shelf_item_delegate.h"
 
+#include "ash/common/wm_lookup.h"
 #include "ash/common/wm_window.h"
+#include "ui/events/event.h"
+#include "ui/views/view.h"
+#include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace test {
 
+namespace {
+
+// Moves |window| to the root window where the |event| occurred.
+// Note: This was forked from ash/wm/window_util.h's wm::MoveWindowToEventRoot.
+void MoveWindowToEventRoot(WmWindow* window, const ui::Event& event) {
+  views::View* target = static_cast<views::View*>(event.target());
+  if (!target)
+    return;
+  WmWindow* target_root =
+      WmLookup::Get()->GetWindowForWidget(target->GetWidget())->GetRootWindow();
+  if (!target_root || target_root == window->GetRootWindow())
+    return;
+  WmWindow* window_container = target_root->GetChildByShellWindowId(
+      window->GetParent()->GetShellWindowId());
+  window_container->AddChild(window);
+}
+
+}  // namespace
+
 TestShelfItemDelegate::TestShelfItemDelegate(WmWindow* window)
     : window_(window), is_draggable_(true) {}
 
@@ -18,7 +41,7 @@ ShelfItemDelegate::PerformedAction TestShelfItemDelegate::ItemSelected(
     const ui::Event& event) {
   if (window_) {
     if (window_->GetType() == ui::wm::WINDOW_TYPE_PANEL)
-      window_->MoveToEventRoot(event);
+      MoveWindowToEventRoot(window_, event);
     window_->Show();
     window_->Activate();
     return kExistingWindowActivated;