Meta/gn: Port #23933

Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/3b89a187ac
Pull-request: https://github.com/SerenityOS/serenity/pull/23955

Meta/gn/secondary/Userland/Libraries/LibWeb/HTML/BUILD.gn

@@ -143,6 +143,7 @@ source_set("HTML") {
     "Plugin.cpp",
     "PluginArray.cpp",
     "PolicyContainers.cpp",
+    "PopStateEvent.cpp",
     "PotentialCORSRequest.cpp",
     "PromiseRejectionEvent.cpp",
     "SelectItem.cpp",

Meta/gn/secondary/Userland/Libraries/LibWeb/idl_files.gni

@@ -212,6 +212,7 @@ standard_idl_files = [
   "//Userland/Libraries/LibWeb/HTML/Path2D.idl",
   "//Userland/Libraries/LibWeb/HTML/Plugin.idl",
   "//Userland/Libraries/LibWeb/HTML/PluginArray.idl",
+  "//Userland/Libraries/LibWeb/HTML/PopStateEvent.idl",
   "//Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.idl",
   "//Userland/Libraries/LibWeb/HTML/Storage.idl",
   "//Userland/Libraries/LibWeb/HTML/SubmitEvent.idl",