Move wm/core to wm namespace.

ui/wm/core/visibility_controller.cc

Index: ui/wm/core/visibility_controller.cc
diff --git a/ui/wm/core/visibility_controller.cc b/ui/wm/core/visibility_controller.cc
index d4c9784a34647553734c9589d199906a7b05b546..fc187a949028c0d6b7683d5b78f8b041abb99782 100644
--- a/ui/wm/core/visibility_controller.cc
+++ b/ui/wm/core/visibility_controller.cc
@@ -9,8 +9,7 @@
 #include "ui/compositor/layer.h"
 #include "ui/wm/core/window_animations.h"
 
-namespace views {
-namespace corewm {
+namespace wm {
 
 namespace {
 
@@ -86,6 +85,5 @@ void SetChildWindowVisibilityChangesAnimated(aura::Window* window) {
   window->SetProperty(kChildWindowVisibilityChangesAnimatedKey, true);
 }
 
-}  // namespace corewm
-}  // namespace views
+}  // namespace wm