Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/toplevel_window_event_handler.cc

Index: ash/wm/toplevel_window_event_handler.cc
diff --git a/ash/wm/toplevel_window_event_handler.cc b/ash/wm/toplevel_window_event_handler.cc
index c7a00c271cc0d4b5d0a23df4d276c5971c588ba2..27c2eaf9cc47d7c687461dc236d5e7fc1cb470a0 100644
--- a/ash/wm/toplevel_window_event_handler.cc
+++ b/ash/wm/toplevel_window_event_handler.cc
@@ -108,7 +108,7 @@ class ToplevelWindowEventHandler::ScopedWindowResizer
 
  private:
   ToplevelWindowEventHandler* handler_;
-  scoped_ptr<WindowResizer> resizer_;
+  std::unique_ptr<WindowResizer> resizer_;
 
   // Whether ScopedWindowResizer grabbed capture.
   bool grabbed_capture_;
@@ -466,7 +466,7 @@ bool ToplevelWindowEventHandler::CompleteDrag(DragCompletionStatus status) {
   if (!window_resizer_)
     return false;
 
-  scoped_ptr<ScopedWindowResizer> resizer(window_resizer_.release());
+  std::unique_ptr<ScopedWindowResizer> resizer(window_resizer_.release());
   switch (status) {
     case DRAG_COMPLETE:
       resizer->resizer()->CompleteDrag();