Moves MruWindowTracker into common

ash/focus_cycler.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/focus_cycler.h"
 
 #include "ash/aura/wm_window_aura.h"
+#include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/shell.h"
-#include "ash/wm/mru_window_tracker.h"
 #include "ash/wm/window_state_aura.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/window.h"
 #include "ui/views/accessible_pane_view.h"
 #include "ui/views/focus/focus_search.h"
 #include "ui/views/widget/widget.h"
 #include "ui/wm/public/activation_client.h"
 
 namespace ash {
 
@@ skipping 90 matching lines @@
 bool FocusCycler::FocusWidget(views::Widget* widget) {
   // Note: It is not necessary to set the focus directly to the pane since that
   // will be taken care of by the widget activation.
   widget_activating_ = widget;
   widget->Activate();
   widget_activating_ = NULL;
   return widget->IsActive();
 }
 
 }  // namespace ash