chromeos: convert more ash/wm code to aura::Window

ash/wm/workspace/workspace_event_handler_aura.cc

Index: ash/wm/workspace/workspace_event_handler_aura.cc
diff --git a/ash/wm/workspace/workspace_event_handler_aura.cc b/ash/wm/workspace/workspace_event_handler_aura.cc
index e7ac65c193bc87e0120411cb1f066acf2dd728d6..a011309991600bb5c8e049490279e7850e1ae735 100644
--- a/ash/wm/workspace/workspace_event_handler_aura.cc
+++ b/ash/wm/workspace/workspace_event_handler_aura.cc
@@ -21,12 +21,12 @@ WorkspaceEventHandlerAura::~WorkspaceEventHandlerAura() {
 
 void WorkspaceEventHandlerAura::OnMouseEvent(ui::MouseEvent* event) {
   WorkspaceEventHandler::OnMouseEvent(
-      event, WmWindow::Get(static_cast<aura::Window*>(event->target())));
+      event, static_cast<aura::Window*>(event->target()));
 }
 
 void WorkspaceEventHandlerAura::OnGestureEvent(ui::GestureEvent* event) {
   WorkspaceEventHandler::OnGestureEvent(
-      event, WmWindow::Get(static_cast<aura::Window*>(event->target())));
+      event, static_cast<aura::Window*>(event->target()));
 }
 
 }  // namespace ash