Reduce the fullscreen window height by 1px on activation loss.

ui/views/widget/desktop_aura/desktop_window_tree_host_win.h

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_win.h
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.h b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.h
index 963658aeb67981a842009f06531f9028ba8c1f69..a32e0542288d012c369f8524e2e6ba0192478ab9 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.h
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.h
@@ -149,7 +149,9 @@ class VIEWS_EXPORT DesktopWindowTreeHostWin
   gfx::NativeViewAccessible GetNativeViewAccessible() override;
   bool ShouldHandleSystemCommands() const override;
   void HandleAppDeactivated() override;
-  void HandleActivationChanged(bool active) override;
+  void HandleActivationChanged(
+      bool active,
+      HWND window_gaining_or_losing_activation) override;
   bool HandleAppCommand(short command) override;
   void HandleCancelMode() override;
   void HandleCaptureLost() override;