Refactors WindowResizers to use ash/wm/common

ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc

Index: ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
diff --git a/ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc b/ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
index 93cefc8ea48c00510279a0352e2751830aae49fa..09451cc6f47c4d13ffe90a8ba7f8c696af76d51c 100644
--- a/ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
+++ b/ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
@@ -13,6 +13,7 @@
 #include "ash/system/tray/system_tray_notifier.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_utils.h"
+#include "ash/wm/common/shelf/wm_shelf_util.h"
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
@@ -61,7 +62,7 @@ void VirtualKeyboardTray::SetShelfAlignment(wm::ShelfAlignment alignment) {
   // Square up the padding if horizontally aligned. Avoid extra padding when
   // vertically aligned as the button would violate the width constraint on the
   // shelf.
-  if (IsHorizontalAlignment(alignment)) {
+  if (wm::IsHorizontalAlignment(alignment)) {
     gfx::Insets insets = button_->GetInsets();
     int additional_padding = std::max(0, top_padding - left_padding);
     left_padding += additional_padding;