Replace scoped_ptr with std::unique_ptr in //ui

ui/views/controls/button/label_button_unittest.cc

Index: ui/views/controls/button/label_button_unittest.cc
diff --git a/ui/views/controls/button/label_button_unittest.cc b/ui/views/controls/button/label_button_unittest.cc
index d036ea3888ad3bf359c9272f01d7a5e5651cb3e8..a95f16b1a60a430a51b35ffca4777f959da84e05 100644
--- a/ui/views/controls/button/label_button_unittest.cc
+++ b/ui/views/controls/button/label_button_unittest.cc
@@ -476,7 +476,7 @@ class InkDropLabelButtonTest : public ViewsTestBase {
 
  protected:
   // Required to host the test target.
-  scoped_ptr<Widget> widget_;
+  std::unique_ptr<Widget> widget_;
 
   // The test target.
   InkDropLabelButton* button_ = nullptr;