Temporary fix to return only the active displays.

ash/display/display_manager.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/display/display_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <map>
@@ skipping 767 matching lines @@
       uint32_t metrics = display::DisplayObserver::DISPLAY_METRIC_BOUNDS |
                          display::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
       if (display_changes.find(updated_index) != display_changes.end())
         metrics |= display_changes[updated_index];
 
       display_changes[updated_index] = metrics;
     }
   }
 
   active_display_list_ = new_displays;
+  active_only_display_list_ = active_display_list_;
 
   RefreshFontParams();
   base::AutoReset<bool> resetter(&change_display_upon_host_resize_, false);
 
   int active_display_list_size = active_display_list_.size();
+  is_updating_display_list_ = true;
   // Temporarily add displays to be removed because display object
   // being removed are accessed during shutting down the root.
   active_display_list_.insert(active_display_list_.end(),
                               removed_displays.begin(), removed_displays.end());
 
   for (const auto& display : removed_displays)
     screen_->NotifyDisplayRemoved(display);
 
   for (size_t index : added_display_indices)
     screen_->NotifyDisplayAdded(active_display_list_[index]);
 
   active_display_list_.resize(active_display_list_size);
+  is_updating_display_list_ = false;
 
   bool notify_primary_change =
       delegate_ ? old_primary.id() != screen_->GetPrimaryDisplay().id() : false;
 
   for (std::map<size_t, uint32_t>::iterator iter = display_changes.begin();
        iter != display_changes.end(); ++iter) {
     uint32_t metrics = iter->second;
     const display::Display& updated_display = active_display_list_[iter->first];
 
     if (notify_primary_change &&
@@ skipping 534 matching lines @@
   layout.ApplyToDisplayList(display_list, updated_ids,
                             kMinimumOverlapForInvalidOffset);
 }
 
 void DisplayManager::RunPendingTasksForTest() {
   if (!software_mirroring_display_list_.empty())
     base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace ash