Replace scoped_ptr with std::unique_ptr in //ui

ui/views/mus/platform_window_mus.cc

Index: ui/views/mus/platform_window_mus.cc
diff --git a/ui/views/mus/platform_window_mus.cc b/ui/views/mus/platform_window_mus.cc
index e536858771c8ae3129b79b4538c1595dea9608f2..14a85e11e6a46b7da99e8bab2cf9c1438f53bf2c 100644
--- a/ui/views/mus/platform_window_mus.cc
+++ b/ui/views/mus/platform_window_mus.cc
@@ -223,7 +223,7 @@ void PlatformWindowMus::OnRequestClose(mus::Window* window) {
 void PlatformWindowMus::OnWindowInputEvent(
     mus::Window* view,
     const ui::Event& event,
-    scoped_ptr<base::Callback<void(bool)>>* ack_callback) {
+    std::unique_ptr<base::Callback<void(bool)>>* ack_callback) {
   // It's possible dispatching the event will spin a nested message loop. Ack
   // the callback now, otherwise we appear unresponsive for the life of the
   // nested message loop.