Revert "GTTF: Add missing virtual destructors."

chrome/browser/ui/panels/display_settings_provider.h

Index: chrome/browser/ui/panels/display_settings_provider.h
diff --git a/chrome/browser/ui/panels/display_settings_provider.h b/chrome/browser/ui/panels/display_settings_provider.h
index bad450251b7928670d133682841d8803fe462a22..61a7a9970c595e1a98f38f5b061bb07133d056e5 100644
--- a/chrome/browser/ui/panels/display_settings_provider.h
+++ b/chrome/browser/ui/panels/display_settings_provider.h
@@ -32,23 +32,17 @@ class DisplaySettingsProvider {
 
   class DisplayAreaObserver {
    public:
-    virtual ~DisplayAreaObserver() { }
-
     virtual void OnDisplayAreaChanged(const gfx::Rect& display_area) = 0;
   };
 
   class DesktopBarObserver {
    public:
-    virtual ~DesktopBarObserver() { }
-
     virtual void OnAutoHidingDesktopBarVisibilityChanged(
         DesktopBarAlignment alignment, DesktopBarVisibility visibility) = 0;
   };
 
   class FullScreenObserver {
    public:
-    virtual ~FullScreenObserver() { }
-
     virtual void OnFullScreenModeChanged(bool is_full_screen) = 0;
   };