Makes Panel related classes use ash/wm/common types

ash/accelerators/accelerator_controller_unittest.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/accelerators/accelerator_controller.h"
 
 #include "ash/accelerators/accelerator_table.h"
 #include "ash/accessibility_delegate.h"
 #include "ash/ash_switches.h"
 #include "ash/display/display_manager.h"
@@ skipping 260 matching lines @@
   static bool is_exiting(ExitWarningHandler* ewh) {
     return ewh->state_ == ExitWarningHandler::EXITING;
   }
   aura::Window* CreatePanel() {
     aura::Window* window =
       CreateTestWindowInShellWithDelegateAndType(NULL,
         ui::wm::WINDOW_TYPE_PANEL, 0, gfx::Rect(5, 5, 20, 20));
     test::TestShelfDelegate* shelf_delegate =
       test::TestShelfDelegate::instance();
     shelf_delegate->AddShelfItem(window);
-    PanelLayoutManager* manager = static_cast<PanelLayoutManager*>(
-        Shell::GetContainer(window->GetRootWindow(),
-                            kShellWindowId_PanelContainer)->layout_manager());
+    PanelLayoutManager* manager =
+        PanelLayoutManager::Get(wm::WmWindowAura::Get(window));
     manager->Relayout();
     return window;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AcceleratorControllerTest);
 };
 
 AcceleratorController* AcceleratorControllerTest::GetController() {
   return Shell::GetInstance()->accelerator_controller();
@@ skipping 1295 matching lines @@
     EXPECT_TRUE(IsMessageCenterEmpty());
 
     // If the action is LOCK_SCREEN, we must reset the state by unlocking the
     // screen before we proceed testing the rest of accelerators.
     ResetStateIfNeeded();
   }
 }
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace ash