fix(windows): Recreate windows files to make sure windows compiles

windows/runner/flutter_window.h

@@ -1,14 +1,14 @@
-#ifndef FLUTTER_WINDOW_H_
-#define FLUTTER_WINDOW_H_
+#ifndef RUNNER_FLUTTER_WINDOW_H_
+#define RUNNER_FLUTTER_WINDOW_H_
 
 #include <flutter/dart_project.h>
 #include <flutter/flutter_view_controller.h>
 
+#include <memory>
+
 #include "run_loop.h"
 #include "win32_window.h"
 
-#include <memory>
-
 // A window that does nothing but host a Flutter view.
 class FlutterWindow : public Win32Window {
  public:
@@ -20,8 +20,10 @@ class FlutterWindow : public Win32Window {
 
  protected:
   // Win32Window:
-  void OnCreate() override;
+  bool OnCreate() override;
   void OnDestroy() override;
+  LRESULT MessageHandler(HWND window, UINT const message, WPARAM const wparam,
+                         LPARAM const lparam) noexcept override;
 
  private:
   // The run loop driving events for this window.
@@ -34,4 +36,4 @@ class FlutterWindow : public Win32Window {
   std::unique_ptr<flutter::FlutterViewController> flutter_controller_;
 };
 
-#endif  // FLUTTER_WINDOW_H_
+#endif  // RUNNER_FLUTTER_WINDOW_H_