ash: Remove broken display notification suppression when settings is open

ash/system/chromeos/screen_layout_observer.h

 // 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.
 
 #ifndef ASH_SYSTEM_CHROMEOS_SCREEN_LAYOUT_OBSERVER_H_
 #define ASH_SYSTEM_CHROMEOS_SCREEN_LAYOUT_OBSERVER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 11 matching lines @@
 // ScreenLayoutObserver is responsible to send notification to users when screen
 // resolution changes or screen rotation changes.
 class ASH_EXPORT ScreenLayoutObserver : public WmDisplayObserver {
  public:
   ScreenLayoutObserver();
   ~ScreenLayoutObserver() override;
 
   // Overridden from WmDisplayObserver:
   void OnDisplayConfigurationChanged() override;
 
+  static void SuppressNotificationsForTesting(bool suppress);
+
  private:
   friend class ScreenLayoutObserverTest;
 
   using DisplayInfoMap = std::map<int64_t, display::ManagedDisplayInfo>;
 
   static const char kNotificationId[];
 
   // Scans the current display info and updates |display_info_|. Sets the
   // previous data to |old_info| if it's not NULL.
   void UpdateDisplayInfo(DisplayInfoMap* old_info);
@@ skipping 13 matching lines @@
                                   const base::string16& additional_message);
 
   DisplayInfoMap display_info_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenLayoutObserver);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_SCREEN_LAYOUT_OBSERVER_H_