[mus+ash] Removes WmWindow from ash/wm/mru_window_tracker and overview mode

chrome/browser/ui/window_sizer/window_sizer_ash.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 "chrome/browser/ui/window_sizer/window_sizer.h"
 
 #include "ash/shell.h"
 #include "ash/wm/window_positioner.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm_window.h"
@@ skipping 92 matching lines @@
     bounds_in_screen->AdjustToFit(display.work_area());
     return;
   }
 
   // The |browser_window| is non NULL when this is called after
   // browser's aura window is created.
   aura::Window* browser_window =
       browser_->window() ? browser_->window()->GetNativeWindow() : NULL;
 
   ash::WindowPositioner::GetBoundsAndShowStateForNewWindow(
-      ash::WmWindow::Get(browser_window), is_saved_bounds, passed_show_state,
-      bounds_in_screen, show_state);
+      browser_window, is_saved_bounds, passed_show_state, bounds_in_screen,
+      show_state);
 }