fix: segfault when moving WebContentsView between BrowserWindows (#44599)

* fix: segfault when moving WebContentsView between BrowserWindows

* chore: actually enable fix

* fixup segfault when moving WebContentsView between BrowserWindows

spec/fixtures/crash-cases/webview-move-between-windows/index.js

@@ -0,0 +1,31 @@
+const { app, BrowserWindow, WebContentsView } = require('electron');
+
+function createWindow () {
+  // Create the browser window.
+  const mainWindow = new BrowserWindow();
+  const secondaryWindow = new BrowserWindow();
+
+  const contentsView = new WebContentsView();
+  mainWindow.contentView.addChildView(contentsView);
+  mainWindow.webContents.setDevToolsWebContents(contentsView.webContents);
+  mainWindow.openDevTools();
+
+  contentsView.setBounds({
+    x: 400,
+    y: 0,
+    width: 400,
+    height: 600
+  });
+
+  setTimeout(() => {
+    secondaryWindow.contentView.addChildView(contentsView);
+    setTimeout(() => {
+      mainWindow.contentView.addChildView(contentsView);
+      app.quit();
+    }, 1000);
+  }, 1000);
+}
+
+app.whenReady().then(() => {
+  createWindow();
+});