Use the correct launcher assets for shelf alignment.

ash/launcher/launcher_alignment_menu.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/launcher/launcher_alignment_menu.h"
 
 #include "ash/shell.h"
+#include "ash/wm/shelf_layout_manager.h"
 #include "ash/wm/shelf_types.h"
 #include "grit/ash_strings.h"
+#include "ui/aura/root_window.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace ash {
 
 LauncherAlignmentMenu::LauncherAlignmentMenu(
     aura::RootWindow* root)
     : ui::SimpleMenuModel(NULL),
       root_window_(root) {
   DCHECK(root_window_);
   int align_group_id = 1;
   set_delegate(this);
   AddRadioItemWithStringId(MENU_ALIGN_LEFT,
                            IDS_AURA_LAUNCHER_CONTEXT_MENU_ALIGN_LEFT,
                            align_group_id);
   AddRadioItemWithStringId(MENU_ALIGN_BOTTOM,
                            IDS_AURA_LAUNCHER_CONTEXT_MENU_ALIGN_BOTTOM,
                            align_group_id);
   AddRadioItemWithStringId(MENU_ALIGN_RIGHT,
                            IDS_AURA_LAUNCHER_CONTEXT_MENU_ALIGN_RIGHT,
                            align_group_id);
 }
 
 LauncherAlignmentMenu::~LauncherAlignmentMenu() {
 }
 
 bool LauncherAlignmentMenu::IsCommandIdChecked(int command_id) const {
-  switch (command_id) {
-    case MENU_ALIGN_LEFT:
-      return Shell::GetInstance()->GetShelfAlignment(root_window_) ==
-          SHELF_ALIGNMENT_LEFT;
-    case MENU_ALIGN_BOTTOM:
-      return Shell::GetInstance()->GetShelfAlignment(root_window_) ==
-          SHELF_ALIGNMENT_BOTTOM;
-    case MENU_ALIGN_RIGHT:
-      return Shell::GetInstance()->GetShelfAlignment(root_window_) ==
-          SHELF_ALIGNMENT_RIGHT;
-    default:
-      return false;
-  }
+  return internal::ShelfLayoutManager::ForLauncher(root_window_)->
+      SelectValueForShelfAlignment(
+          MENU_ALIGN_BOTTOM == command_id,
+          MENU_ALIGN_LEFT == command_id,
+          MENU_ALIGN_RIGHT == command_id);
 }
 
 bool LauncherAlignmentMenu::IsCommandIdEnabled(int command_id) const {
   return true;
 }
 
 bool LauncherAlignmentMenu::GetAcceleratorForCommandId(
       int command_id,
       ui::Accelerator* accelerator) {
   return false;
@@ skipping 10 matching lines @@
                                               root_window_);
       break;
     case MENU_ALIGN_RIGHT:
       Shell::GetInstance()->SetShelfAlignment(SHELF_ALIGNMENT_RIGHT,
                                               root_window_);
       break;
   }
 }
 
 }  // namespace ash