Fix the full screen switching browser window dipping below launcher bar issue.

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index b04857d1162eac1f149b3bff809ea1e1cb8c5e90..afe767a17bf85245ce2fe7d1f37da41314f63120 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -125,6 +125,9 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // Called when the host changes size.
   void OnHostResized(const gfx::Size& size);
 
+  // Called after the screen's work_area_insets_ changed.
+  void OnScreenWorkAreaInsetsChanged();
+
   // Called when the native screen's resolution changes.
   void OnNativeScreenResized(const gfx::Size& size);