services/{ui,shell}: Change auto to not deduce raw pointers.

services/ui/ws/modal_window_controller.cc

Index: services/ui/ws/modal_window_controller.cc
diff --git a/services/ui/ws/modal_window_controller.cc b/services/ui/ws/modal_window_controller.cc
index 44d7891b76f432b89a11ab9f148a852e79c46182..07c2e11ab9a22d91c1172e1f9d01ad6bc5b03d18 100644
--- a/services/ui/ws/modal_window_controller.cc
+++ b/services/ui/ws/modal_window_controller.cc
@@ -16,7 +16,7 @@ namespace {
 const ServerWindow* GetModalChildForWindowAncestor(const ServerWindow* window) {
   for (const ServerWindow* ancestor = window; ancestor;
        ancestor = ancestor->parent()) {
-    for (const auto& transient_child : ancestor->transient_children()) {
+    for (auto* transient_child : ancestor->transient_children()) {
       if (transient_child->is_modal() && transient_child->IsDrawn())
         return transient_child;
     }