mus: aura::Env should be destroyed last in the mus client.

chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc

Index: chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc
diff --git a/chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc b/chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc
index 85348ed4e4bb2cb00d2d5cf8965c7713eae741bd..538bc43b1d77405416f2d3ba610372ba8365f3f4 100644
--- a/chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc
+++ b/chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc
@@ -66,9 +66,7 @@ ChromeBrowserMainExtraPartsViewsLinux::ChromeBrowserMainExtraPartsViewsLinux() {
 
 ChromeBrowserMainExtraPartsViewsLinux::
     ~ChromeBrowserMainExtraPartsViewsLinux() {
-  // X11DesktopHandler is destructed at this point, so we don't need to remove
-  // ourselves as an X11DesktopHandlerObserver
-  DCHECK(!aura::Env::GetInstanceDontCreate());
+  views::X11DesktopHandler::get()->RemoveObserver(this);
 }
 
 void ChromeBrowserMainExtraPartsViewsLinux::PreEarlyInitialization() {