Add content_browser manifest handling

Task-number: QTBUG-69281
Change-Id: If48d1a7ad723b18d4577d675b11c0cdc5e22f758
Reviewed-by: Allan Sandfeld Jensen <[email protected]>
Reviewed-by: Kai Koehne <[email protected]>

Author: Michal Klocek

src/core/content_browser_client_qt.cpp

@@ -689,6 +689,8 @@ std::unique_ptr<base::Value> ContentBrowserClientQt::GetServiceManifestOverlay(b
         id = IDR_QTWEBENGINE_CONTENT_PACKAGED_SERVICES_MANIFEST_OVERLAY;
     else if (name == content::mojom::kRendererServiceName)
         id = IDR_QTWEBENGINE_CONTENT_RENDERER_MANIFEST_OVERLAY;
+    else if (name == content::mojom::kBrowserServiceName)
+        id = IDR_QTWEBENGINE_CONTENT_BROWSER_MANIFEST_OVERLAY;
     if (id == -1)
         return nullptr;