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.cc
#if defined(USE_X11)
  
  gtk_ui_delegate_ =
      std::make_unique<ui::GtkUiDelegateX11>(x11::Connection::Get());
  ui::GtkUiDelegate::SetInstance(gtk_ui_delegate_.get());
  views::LinuxUI* linux_ui = BuildGtkUi(gtk_ui_delegate_.get());
  views::LinuxUI::SetInstance(linux_ui);
  linux_ui->Initialize();
  
  
  
  
  UpdateDarkThemeSetting();
  
  
  dark_theme_observer_.reset(new DarkThemeObserver);
  linux_ui->GetNativeTheme(nullptr)->AddObserver(dark_theme_observer_.get());
#endif
#if defined(USE_AURA)
  wm_state_ = std::make_unique<wm::WMState>();