[MacViews] Update AppWindow when the native window changes fullscreen state.

chrome/browser/ui/views/apps/app_window_native_widget_mac.h

Index: chrome/browser/ui/views/apps/app_window_native_widget_mac.h
diff --git a/chrome/browser/ui/views/apps/app_window_native_widget_mac.h b/chrome/browser/ui/views/apps/app_window_native_widget_mac.h
index f7deb705bc3d27d2cabc82df076225d7c8a49ea5..64a443fcc18dc041eab3fdd3ab6dc46f2657220d 100644
--- a/chrome/browser/ui/views/apps/app_window_native_widget_mac.h
+++ b/chrome/browser/ui/views/apps/app_window_native_widget_mac.h
@@ -7,18 +7,19 @@
 
 #include "ui/views/widget/native_widget_mac.h"
 
-namespace extensions {
-class NativeAppWindow;
-}
+class ChromeNativeAppWindowViews;
 
 // This implements features specific to app windows, e.g. frameless windows that
 // behave like normal windows.
 class AppWindowNativeWidgetMac : public views::NativeWidgetMac {
  public:
   AppWindowNativeWidgetMac(views::Widget* widget,
-                           extensions::NativeAppWindow* native_app_window);
+                           ChromeNativeAppWindowViews* native_app_window);
   ~AppWindowNativeWidgetMac() override;
 
+  // NativeWidgetMac:
+  void OnFullscreenTransitionComplete(bool is_fullscreen) override;
+
  protected:
   // NativeWidgetMac:
   gfx::NativeWindow CreateNSWindow(
@@ -27,7 +28,7 @@ class AppWindowNativeWidgetMac : public views::NativeWidgetMac {
  private:
   // Weak. Owned by extensions::AppWindow (which manages our Widget via its
   // WebContents).
-  extensions::NativeAppWindow* native_app_window_;
+  ChromeNativeAppWindowViews* native_app_window_;
 
   DISALLOW_COPY_AND_ASSIGN(AppWindowNativeWidgetMac);
 };