Remove WmLookup.

ash/common/wm/window_positioning_utils.cc

Index: ash/common/wm/window_positioning_utils.cc
diff --git a/ash/common/wm/window_positioning_utils.cc b/ash/common/wm/window_positioning_utils.cc
index 075090e397681eff224815a6394474c03ea5462f..babed2f4456c1c9a052f946f5299ca5d6441a038 100644
--- a/ash/common/wm/window_positioning_utils.cc
+++ b/ash/common/wm/window_positioning_utils.cc
@@ -10,10 +10,10 @@
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm/wm_event.h"
 #include "ash/common/wm/wm_screen_util.h"
-#include "ash/common/wm_lookup.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/root_window_controller.h"
+#include "ash/shell.h"
 #include "ui/aura/window_tracker.h"
 #include "ui/display/display.h"
 #include "ui/display/types/display_constants.h"
@@ -47,9 +47,8 @@ bool IsWindowOrAncestorLockedToRoot(const WmWindow* window) {
 // the child windows and transient children of the transient children.
 void MoveAllTransientChildrenToNewRoot(const display::Display& display,
                                        WmWindow* window) {
-  WmWindow* dst_root = WmLookup::Get()
-                           ->GetRootWindowControllerWithDisplayId(display.id())
-                           ->GetWindow();
+  WmWindow* dst_root =
+      Shell::GetRootWindowControllerWithDisplayId(display.id())->GetWindow();
   for (WmWindow* transient_child : window->GetTransientChildren()) {
     const int container_id = transient_child->GetParent()->GetShellWindowId();
     DCHECK_GE(container_id, 0);
@@ -139,7 +138,7 @@ void SetBoundsInScreen(WmWindow* window,
   if (!window->GetTransientParent() &&
       !IsWindowOrAncestorLockedToRoot(window)) {
     RootWindowController* dst_root_window_controller =
-        WmLookup::Get()->GetRootWindowControllerWithDisplayId(display.id());
+        Shell::GetRootWindowControllerWithDisplayId(display.id());
     DCHECK(dst_root_window_controller);
     WmWindow* dst_root = dst_root_window_controller->GetWindow();
     DCHECK(dst_root);