mash: Remove last WmWindow uses in ash/shelf.

chrome/browser/ui/ash/shelf_browsertest.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/shelf/shelf.h"
 #include "ash/shelf/shelf_layout_manager.h"
-#include "ash/wm_window.h"
 #include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/status_bubble.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chromeos/chromeos_switches.h"
 #include "components/user_manager/user_names.h"
 
@@ skipping 38 matching lines @@
   }
 };
 
 // Tests that in guest session, shelf alignment could be initialized to bottom
 // aligned, instead of bottom locked (crbug.com/699661).
 IN_PROC_BROWSER_TEST_F(ShelfGuestSessionBrowserTest, ShelfAlignment) {
   ash::Shelf* shelf =
       ash::Shelf::ForWindow(browser()->window()->GetNativeWindow());
   EXPECT_EQ(ash::SHELF_ALIGNMENT_BOTTOM, shelf->alignment());
 }