Found while investigating #25021

ElectronBrowserMainParts has a periodic timer that is used to trigger GC once a minute even on an idle system. While one wakeup per minute isn't bad, it's also been in there [since 2014](https://github.com/electron/electron/commit/4dd78480846557370dd53789d50e6cb0d6a81bcd) and may or may not still be necessary. It might be worth seeing what happens to memory overhead if this is disabled and/or triggered with a different mechanism.

```c++
  // Start idle gc.
  gc_timer_.Start(
      FROM_HERE, base::TimeDelta::FromMinutes(1),
      base::Bind(&v8::Isolate::LowMemoryNotification,
                 base::Unretained(js_env_->isolate())));
```


shell/browser/electron_browser_main_parts.h
std::unique_ptr<ui::GtkUiDelegate> gtk_ui_delegate_;
  
  std::unique_ptr<DarkThemeObserver> dark_theme_observer_;
#endif
  std::unique_ptr<views::LayoutProvider> layout_provider_;
  
  std::unique_ptr<BrowserProcessImpl> fake_browser_process_;
  
  int* exit_code_ = nullptr;
  std::unique_ptr<JavascriptEnvironment> js_env_;
  std::unique_ptr<Browser> browser_;
  std::unique_ptr<NodeBindings> node_bindings_;
  std::unique_ptr<ElectronBindings> electron_bindings_;
  std::unique_ptr<NodeEnvironment> node_env_;
  std::unique_ptr<IconManager> icon_manager_;
  std::unique_ptr<base::FieldTrialList> field_trial_list_;
#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
  std::unique_ptr<ElectronExtensionsClient> extensions_client_;
  std::unique_ptr<ElectronExtensionsBrowserClient> extensions_browser_client_;
#endif
  base::RepeatingTimer gc_timer_;
  
  std::list<base::OnceClosure> destructors_;
  mojo::Remote<device::mojom::GeolocationControl> geolocation_control_;
  static ElectronBrowserMainParts* self_;
  DISALLOW_COPY_AND_ASSIGN(ElectronBrowserMainParts);
};
}  
#endif