Convert Pass()→std::move() in //ash

ash/wm/window_animations.cc

Index: ash/wm/window_animations.cc
diff --git a/ash/wm/window_animations.cc b/ash/wm/window_animations.cc
index 93af37a0bb24c4d2b51d9290d2b95b3f99ea5aed..fc1422470e2e513be8c55b8a9d4cc5b6f0cfb0bb 100644
--- a/ash/wm/window_animations.cc
+++ b/ash/wm/window_animations.cc
@@ -5,8 +5,8 @@
 #include "ash/wm/window_animations.h"
 
 #include <math.h>
-
 #include <algorithm>
+#include <utility>
 #include <vector>
 
 #include "ash/screen_util.h"
@@ -271,8 +271,7 @@ class CrossFadeObserver : public ui::CompositorObserver,
   // Takes ownership of |layer| and its child layers.
   CrossFadeObserver(aura::Window* window,
                     scoped_ptr<ui::LayerTreeOwner> layer_owner)
-      : window_(window),
-        layer_owner_(layer_owner.Pass()) {
+      : window_(window), layer_owner_(std::move(layer_owner)) {
     window_->AddObserver(this);
     layer_owner_->root()->GetCompositor()->AddObserver(this);
   }
@@ -342,7 +341,8 @@ base::TimeDelta CrossFadeAnimation(
     ui::ScopedLayerAnimationSettings settings(old_layer->GetAnimator());
 
     // Animation observer owns the old layer and deletes itself.
-    settings.AddObserver(new CrossFadeObserver(window, old_layer_owner.Pass()));
+    settings.AddObserver(
+        new CrossFadeObserver(window, std::move(old_layer_owner)));
     settings.SetTransitionDuration(duration);
     settings.SetTweenType(tween_type);
     gfx::Transform out_transform;