Moves creation of LockLayoutManager to common code

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index caac66a71de7efb962fd46a6bdbe94664d9c6f58..ea3549768be4e0142a0928aabe9e949dec20dc84 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -31,7 +31,6 @@
 #include "ash/common/wm/container_finder.h"
 #include "ash/common/wm/dock/docked_window_layout_manager.h"
 #include "ash/common/wm/fullscreen_window_finder.h"
-#include "ash/common/wm/lock_layout_manager.h"
 #include "ash/common/wm/panels/panel_layout_manager.h"
 #include "ash/common/wm/root_window_layout_manager.h"
 #include "ash/common/wm/switchable_windows.h"
@@ -617,12 +616,6 @@ void RootWindowController::InitLayoutManagers() {
 
   aura::Window* root_window = GetRootWindow();
 
-  WmWindow* lock_container = WmWindowAura::Get(
-      root_window->GetChildById(kShellWindowId_LockScreenContainer));
-  DCHECK(lock_container);
-  lock_container->SetLayoutManager(
-      base::MakeUnique<LockLayoutManager>(lock_container));
-
   WmWindow* always_on_top_container =
       WmWindowAura::Get(GetContainer(kShellWindowId_AlwaysOnTopContainer));
   always_on_top_controller_.reset(