Refactors WindowResizers to use ash/wm/common

ash/system/chromeos/screen_security/screen_tray_item.cc

Index: ash/system/chromeos/screen_security/screen_tray_item.cc
diff --git a/ash/system/chromeos/screen_security/screen_tray_item.cc b/ash/system/chromeos/screen_security/screen_tray_item.cc
index c1efaf136722cc87061b26fa696e151e2924ae32..6322824b227bf7c1caad854c2b6d27882dad8ad1 100644
--- a/ash/system/chromeos/screen_security/screen_tray_item.cc
+++ b/ash/system/chromeos/screen_security/screen_tray_item.cc
@@ -7,6 +7,7 @@
 #include "ash/shelf/shelf_util.h"
 #include "ash/system/tray/fixed_sized_image_view.h"
 #include "ash/system/tray/tray_constants.h"
+#include "ash/wm/common/shelf/wm_shelf_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/message_center/message_center.h"
 #include "ui/views/controls/label.h"
@@ -189,7 +190,7 @@ void ScreenTrayItem::UpdateAfterShelfAlignmentChange(
     return;
 
   // Center the item dependent on the orientation of the shelf.
-  views::BoxLayout::Orientation layout = IsHorizontalAlignment(alignment)
+  views::BoxLayout::Orientation layout = wm::IsHorizontalAlignment(alignment)
                                              ? views::BoxLayout::kHorizontal
                                              : views::BoxLayout::kVertical;
   tray_view_->SetLayoutManager(new views::BoxLayout(layout, 0, 0, 0));