mash: remove more shell/shelf WmWindow usage.

chrome/browser/ui/window_sizer/window_sizer_ash_uitest.cc

 // Copyright 2013 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_view.h"
 #include "ash/shelf/wm_shelf.h"
 #include "ash/shell.h"
 #include "ash/wm_window.h"
 #include "base/command_line.h"
 #include "base/location.h"
@@ skipping 36 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(WindowSizerTest);
 };
 
 void CloseBrowser(Browser* browser) {
   browser->window()->Close();
   base::RunLoop().RunUntilIdle();
 }
 
 gfx::Rect GetChromeIconBoundsForRootWindow(aura::Window* root_window) {
   const ash::ShelfView* shelf_view =
-      ash::WmShelf::ForWindow(ash::WmWindow::Get(root_window))
-          ->GetShelfViewForTesting();
+      ash::WmShelf::ForWindow(root_window)->GetShelfViewForTesting();
   const views::ViewModel* view_model = shelf_view->view_model_for_test();
 
   EXPECT_EQ(2, view_model->view_size());
   return view_model->view_at(1)->GetBoundsInScreen();
 }
 
 void OpenBrowserUsingShelfOnRootWindow(aura::Window* root_window) {
   ui::test::EventGenerator generator(root_window);
   gfx::Point center =
       GetChromeIconBoundsForRootWindow(root_window).CenterPoint();
@@ skipping 130 matching lines @@
 
   CloseBrowser(browser_list->get(0));
   OpenBrowserUsingContextMenuOnRootWindow(root_windows[0]);
 
   // Next new browser must be created on 1st display.
   ASSERT_EQ(1u, browser_list->size());
   EXPECT_EQ(root_windows[0],
             browser_list->get(0)->window()->GetNativeWindow()->GetRootWindow());
   EXPECT_EQ(root_windows[0], ash::Shell::GetRootWindowForNewWindows());
 }