Moves MruWindowTracker into common

ash/wm/ash_focus_rules.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/wm/ash_focus_rules.h"
 
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm/focus_rules.h"
+#include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
-#include "ash/wm/mru_window_tracker.h"
 #include "ash/wm/window_state_aura.h"
 #include "ui/aura/window.h"
 
 namespace ash {
 namespace wm {
 namespace {
 
 bool BelongsToContainerWithEqualOrGreaterId(const aura::Window* window,
                                             int container_id) {
   for (; window; window = window->parent()) {
@@ skipping 117 matching lines @@
     if (*i != ignore &&
         window_state->CanActivate() &&
         !window_state->IsMinimized())
       return *i;
   }
   return NULL;
 }
 
 }  // namespace wm
 }  // namespace ash