Replace scoped_ptr with std::unique_ptr in //ui

ui/views/controls/button/custom_button.cc

Index: ui/views/controls/button/custom_button.cc
diff --git a/ui/views/controls/button/custom_button.cc b/ui/views/controls/button/custom_button.cc
index 9a0e28a65a5e92a62935741c130cbb0fb2dd4962..c119342098cc1fec00a0a41ce77efd758358193f 100644
--- a/ui/views/controls/button/custom_button.cc
+++ b/ui/views/controls/button/custom_button.cc
@@ -379,7 +379,7 @@ void CustomButton::VisibilityChanged(View* starting_from, bool visible) {
   SetState(visible && ShouldEnterHoveredState() ? STATE_HOVERED : STATE_NORMAL);
 }
 
-scoped_ptr<InkDropHover> CustomButton::CreateInkDropHover() const {
+std::unique_ptr<InkDropHover> CustomButton::CreateInkDropHover() const {
   return ShouldShowInkDropHover() ? Button::CreateInkDropHover() : nullptr;
 }