Replace scoped_ptr with std::unique_ptr in //ui

ui/base/idle/idle_query_x11.h

Index: ui/base/idle/idle_query_x11.h
diff --git a/ui/base/idle/idle_query_x11.h b/ui/base/idle/idle_query_x11.h
index e5f6b96cbd1bae01a8cfd08e2aece368591723a4..0857418897e8417c4a28523f1b66a692442f70c0 100644
--- a/ui/base/idle/idle_query_x11.h
+++ b/ui/base/idle/idle_query_x11.h
@@ -5,8 +5,9 @@
 #ifndef UI_BASE_IDLE_IDLE_QUERY_X11_H_
 #define UI_BASE_IDLE_IDLE_QUERY_X11_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 
 namespace ui {
 
@@ -20,7 +21,7 @@ class IdleQueryX11 {
   int IdleTime();
 
  private:
-  scoped_ptr<IdleData> idle_data_;
+  std::unique_ptr<IdleData> idle_data_;
 
   DISALLOW_COPY_AND_ASSIGN(IdleQueryX11);
 };