mash: Migrate shelf app list button to wm common types

ash/accelerators/accelerator_interactive_uitest_chromeos.cc

 // Copyright 2015 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/common/shell_observer.h"
 #include "ash/common/system/chromeos/network/network_observer.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
@@ skipping 180 matching lines @@
   EXPECT_TRUE(network_observer.wifi_enabled_status());
   SendKeyPressSync(ui::VKEY_WLAN, false, false, false);
   EXPECT_FALSE(network_observer.wifi_enabled_status());
 
   WmShell::Get()->system_tray_notifier()->RemoveNetworkObserver(
       &network_observer);
 }
 
 // Tests the app list accelerator.
 TEST_F(AcceleratorInteractiveUITest, MAYBE_ToggleAppList) {
-  EXPECT_FALSE(Shell::GetInstance()->GetAppListTargetVisibility());
+  EXPECT_FALSE(WmShell::Get()->GetAppListTargetVisibility());
   SendKeyPressSync(ui::VKEY_LWIN, false, false, false);
-  EXPECT_TRUE(Shell::GetInstance()->GetAppListTargetVisibility());
+  EXPECT_TRUE(WmShell::Get()->GetAppListTargetVisibility());
   SendKeyPressSync(ui::VKEY_LWIN, false, false, false);
-  EXPECT_FALSE(Shell::GetInstance()->GetAppListTargetVisibility());
+  EXPECT_FALSE(WmShell::Get()->GetAppListTargetVisibility());
 }
 
 }  // namespace test
 }  // namespace ash