Convert Pass()→std::move() in //ash

ash/wm/lock_window_state.cc

Index: ash/wm/lock_window_state.cc
diff --git a/ash/wm/lock_window_state.cc b/ash/wm/lock_window_state.cc
index 6230dd13dbd0b3eac8fde5069de3aad920950b38..7e5b4ec37331f5eb57087b25d8d1e95595bc6f87 100644
--- a/ash/wm/lock_window_state.cc
+++ b/ash/wm/lock_window_state.cc
@@ -4,6 +4,8 @@
 
 #include "ash/wm/lock_window_state.h"
 
+#include <utility>
+
 #include "ash/display/display_manager.h"
 #include "ash/screen_util.h"
 #include "ash/shell.h"
@@ -112,7 +114,7 @@ void LockWindowState::DetachState(wm::WindowState* window_state) {
 wm::WindowState* LockWindowState::SetLockWindowState(aura::Window* window) {
   scoped_ptr<wm::WindowState::State> lock_state(new LockWindowState(window));
   scoped_ptr<wm::WindowState::State> old_state(
-      wm::GetWindowState(window)->SetStateObject(lock_state.Pass()));
+      wm::GetWindowState(window)->SetStateObject(std::move(lock_state)));
   return wm::GetWindowState(window);
 }