Replace scoped_ptr with std::unique_ptr in //ui

ui/wm/core/wm_state.h

Index: ui/wm/core/wm_state.h
diff --git a/ui/wm/core/wm_state.h b/ui/wm/core/wm_state.h
index 217434ffaf482b27f35e57c3f7fde86ed9b9b298..620315c2603bdb9d54c75a019580504aa65187d2 100644
--- a/ui/wm/core/wm_state.h
+++ b/ui/wm/core/wm_state.h
@@ -5,8 +5,9 @@
 #ifndef UI_WM_CORE_WM_STATE_H_
 #define UI_WM_CORE_WM_STATE_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/wm/wm_export.h"
 
 namespace wm {
@@ -22,8 +23,8 @@ class WM_EXPORT WMState {
 
   // WindowStackingClient:
  private:
-  scoped_ptr<TransientWindowStackingClient> window_stacking_client_;
-  scoped_ptr<TransientWindowController> transient_window_client_;
+  std::unique_ptr<TransientWindowStackingClient> window_stacking_client_;
+  std::unique_ptr<TransientWindowController> transient_window_client_;
 
   DISALLOW_COPY_AND_ASSIGN(WMState);
 };