Remove stl_util's deletion function use from ui/.

ui/wm/core/transient_window_manager.cc

Index: ui/wm/core/transient_window_manager.cc
diff --git a/ui/wm/core/transient_window_manager.cc b/ui/wm/core/transient_window_manager.cc
index 3145c341d29bebb4ee43b19ade0e5bdede7ccc7c..dc6070f8c3d63301e78ace540c1c39a915ab3522 100644
--- a/ui/wm/core/transient_window_manager.cc
+++ b/ui/wm/core/transient_window_manager.cc
@@ -8,7 +8,6 @@
 #include <functional>
 
 #include "base/auto_reset.h"
-#include "base/stl_util.h"
 #include "ui/aura/client/transient_window_client_observer.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_property.h"
@@ -231,7 +230,8 @@ void TransientWindowManager::OnWindowDestroying(Window* window) {
   // parent, as destroying an active transient child may otherwise attempt to
   // refocus us.
   Windows transient_children(transient_children_);
-  base::STLDeleteElements(&transient_children);
+  for (auto* child : transient_children)
+    delete child;
   DCHECK(transient_children_.empty());
 }