Moves MruWindowTracker to WmShell

ash/wm/overview/window_selector_controller.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/wm/overview/window_selector_controller.h"
 
 #include <vector>
 
 #include "ash/common/session/session_state_delegate.h"
+#include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/wm/overview/window_selector.h"
 #include "base/metrics/histogram.h"
 
 namespace ash {
 
@@ skipping 16 matching lines @@
 }
 
 void WindowSelectorController::ToggleOverview() {
   if (IsSelecting()) {
     OnSelectionEnded();
   } else {
     // Don't start overview if window selection is not allowed.
     if (!CanSelect())
       return;
 
-    std::vector<WmWindow*> windows = WmShell::Get()->GetMruWindowList();
+    std::vector<WmWindow*> windows =
+        WmShell::Get()->mru_window_tracker()->BuildMruWindowList();
     auto end =
         std::remove_if(windows.begin(), windows.end(),
                        std::not1(std::ptr_fun(&WindowSelector::IsSelectable)));
     windows.resize(end - windows.begin());
 
     // Don't enter overview mode with no windows.
     if (windows.empty())
       return;
 
     Shell::GetInstance()->OnOverviewModeStarting();
@@ skipping 23 matching lines @@
 
 void WindowSelectorController::OnSelectionStarted() {
   if (!last_selection_time_.is_null()) {
     UMA_HISTOGRAM_LONG_TIMES(
         "Ash.WindowSelector.TimeBetweenUse",
         base::Time::Now() - last_selection_time_);
   }
 }
 
 }  // namespace ash