Cleanup: remove Details::window. Use GetTarget() when possible

ash/wm/default_window_resizer.cc

Index: ash/wm/default_window_resizer.cc
diff --git a/ash/wm/default_window_resizer.cc b/ash/wm/default_window_resizer.cc
index 97dbbe7773a4020c7636e317eabf2285a98b0037..49c367e15bcd4fa25eccdd8c0222a396c2dd1cc3 100644
--- a/ash/wm/default_window_resizer.cc
+++ b/ash/wm/default_window_resizer.cc
@@ -32,11 +32,11 @@ DefaultWindowResizer::Create(aura::Window* window,
 
 void DefaultWindowResizer::Drag(const gfx::Point& location, int event_flags) {
   gfx::Rect bounds(CalculateBoundsForDrag(details_, location));
-  if (bounds != details_.window->bounds()) {
+  if (bounds != GetTarget()->bounds()) {
     if (!did_move_or_resize_ && !details_.restore_bounds.IsEmpty())
-      wm::GetWindowState(details_.window)->ClearRestoreBounds();
+      wm::GetWindowState(GetTarget())->ClearRestoreBounds();
     did_move_or_resize_ = true;
-    details_.window->SetBounds(bounds);
+    GetTarget()->SetBounds(bounds);
   }
 }
 
@@ -47,15 +47,15 @@ void DefaultWindowResizer::RevertDrag() {
   if (!did_move_or_resize_)
     return;
 
-  details_.window->SetBounds(details_.initial_bounds_in_parent);
+  GetTarget()->SetBounds(details_.initial_bounds_in_parent);
 
   if (!details_.restore_bounds.IsEmpty())
-    wm::GetWindowState(details_.window)->SetRestoreBoundsInScreen(
+    wm::GetWindowState(GetTarget())->SetRestoreBoundsInScreen(
         details_.restore_bounds);
 }
 
 aura::Window* DefaultWindowResizer::GetTarget() {
-  return details_.window;
+  return details_.window();
 }
 
 const gfx::Point& DefaultWindowResizer::GetInitialLocation() const {