ui: use base's ContainsValue helper function instead of std::find

ui/wm/core/window_animations.cc

Index: ui/wm/core/window_animations.cc
diff --git a/ui/wm/core/window_animations.cc b/ui/wm/core/window_animations.cc
index 129cfda8b22facd180dd5bd77c0993fe2729b057..9ef09cd13f51ced90517709d11203a2bab2bb59b 100644
--- a/ui/wm/core/window_animations.cc
+++ b/ui/wm/core/window_animations.cc
@@ -95,11 +95,8 @@ class HidingWindowAnimationObserverBase : public aura::WindowObserver {
       DCHECK(iter != window_->parent()->children().end());
       aura::Window* topmost_transient_child = NULL;
       for (++iter; iter != window_->parent()->children().end(); ++iter) {
-        if (std::find(transient_children.begin(),
-                      transient_children.end(),
-                      *iter) != transient_children.end()) {
+        if (ContainsValue(transient_children, *iter))
           topmost_transient_child = *iter;
-        }
       }
       if (topmost_transient_child) {
         window_->parent()->layer()->StackAbove(