refactor: node::Environment self-cleanup (#39604)

* chore: savepoint

* chore: turn raw_ptr tests back off

shell/renderer/web_worker_observer.h

@@ -6,9 +6,16 @@
 #define ELECTRON_SHELL_RENDERER_WEB_WORKER_OBSERVER_H_
 
 #include <memory>
+#include <set>
 
 #include "v8/include/v8.h"
 
+namespace node {
+
+class Environment;
+
+}  // namespace node
+
 namespace electron {
 
 class ElectronBindings;
@@ -35,6 +42,7 @@ class WebWorkerObserver {
  private:
   std::unique_ptr<NodeBindings> node_bindings_;
   std::unique_ptr<ElectronBindings> electron_bindings_;
+  std::set<std::shared_ptr<node::Environment>> environments_;
 };
 
 }  // namespace electron