winit: don't explicitly handle Cmd-Q and Alt-F4 (#881)

Closes https://github.com/emilk/egui/issues/877

Still a problem: https://github.com/rust-windowing/winit/issues/1998

egui_glium/src/epi_backend.rs

@@ -1,7 +1,6 @@
 use crate::*;
 use egui::Color32;
-#[cfg(target_os = "windows")]
-use glium::glutin::platform::windows::WindowBuilderExtWindows;
+use glium::glutin;
 
 impl epi::TextureAllocator for Painter {
     fn alloc_srgba_premultiplied(

egui_glium/src/lib.rs

@@ -97,8 +97,6 @@ pub use epi_backend::{run, NativeOptions};
 
 pub use egui_winit;
 
-use glium::glutin;
-
 // ----------------------------------------------------------------------------
 
 /// Convenience wrapper for using [`egui`] from a [`glium`] app.
@@ -127,11 +125,6 @@ impl EguiGlium {
         self.egui_winit.on_event(&self.egui_ctx, event)
     }
 
-    /// Is this a close event or a Cmd-Q/Alt-F4 keyboard command?
-    pub fn is_quit_event(&self, event: &glutin::event::WindowEvent<'_>) -> bool {
-        self.egui_winit.is_quit_event(event)
-    }
-
     /// Returns `needs_repaint` and shapes to draw.
     pub fn run(
         &mut self,