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

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 32e55635d1a4c773d6298b62dc90aafa936d3fda..80a7c51d4b14974e068079e0d53d7cde06804f81 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -1205,10 +1205,6 @@ void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
     parts_->PostMainMessageLoopRun();
   }
 
-#if defined(USE_AURA)
-  env_.reset();
-#endif
-
   system_stats_monitor_.reset();
 
   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to