Remove WmLookup.

ash/system/web_notification/ash_popup_alignment_delegate_unittest.cc

Index: ash/system/web_notification/ash_popup_alignment_delegate_unittest.cc
diff --git a/ash/system/web_notification/ash_popup_alignment_delegate_unittest.cc b/ash/system/web_notification/ash_popup_alignment_delegate_unittest.cc
index e4ac1a1233252c128d6871da8979d38ddf667f68..b8982131597565b77a19065ef3c0855578ee8ffc 100644
--- a/ash/system/web_notification/ash_popup_alignment_delegate_unittest.cc
+++ b/ash/system/web_notification/ash_popup_alignment_delegate_unittest.cc
@@ -8,7 +8,6 @@
 #include <vector>
 
 #include "ash/common/shelf/wm_shelf.h"
-#include "ash/common/wm_lookup.h"
 #include "ash/common/wm_window.h"
 #include "ash/public/cpp/shelf_types.h"
 #include "ash/public/cpp/shell_window_ids.h"
@@ -236,8 +235,7 @@ TEST_F(AshPopupAlignmentDelegateTest, Extended) {
 
   display::Display second_display = display_manager()->GetDisplayAt(1u);
   WmShelf* second_shelf =
-      WmLookup::Get()
-          ->GetRootWindowControllerWithDisplayId(second_display.id())
+      Shell::GetRootWindowControllerWithDisplayId(second_display.id())
           ->GetShelf();
   AshPopupAlignmentDelegate for_2nd_display(second_shelf);
   UpdateWorkArea(&for_2nd_display, second_display);