Shuffles and renames ash/common/wm classes

ash/system/status_area_widget.h

Index: ash/system/status_area_widget.h
diff --git a/ash/system/status_area_widget.h b/ash/system/status_area_widget.h
index 6b00f202fa8d861953e45128e11083fe1e9710b9..b6887447933e21779127fa42d8679f50b5aa89b6 100644
--- a/ash/system/status_area_widget.h
+++ b/ash/system/status_area_widget.h
@@ -18,17 +18,15 @@ class ShellDelegate;
 class StatusAreaWidgetDelegate;
 class SystemTray;
 class WebNotificationTray;
+class WmWindow;
 #if defined(OS_CHROMEOS)
 class LogoutButtonTray;
 class VirtualKeyboardTray;
 #endif
-namespace wm {
-class WmWindow;
-}
 
 class ASH_EXPORT StatusAreaWidget : public views::Widget {
  public:
-  StatusAreaWidget(wm::WmWindow* status_container, ShelfWidget* shelf_widget);
+  StatusAreaWidget(WmWindow* status_container, ShelfWidget* shelf_widget);
   ~StatusAreaWidget() override;
 
   // Creates the SystemTray, WebNotificationTray and LogoutButtonTray.