Fix crash in shutdown of cast_shell browser process

chromecast/browser/cast_browser_process.cc

Index: chromecast/browser/cast_browser_process.cc
diff --git a/chromecast/browser/cast_browser_process.cc b/chromecast/browser/cast_browser_process.cc
index ccd04ae94847286f6b7f355d6e368ad9d5ca6cc9..25fcd44ff4a56b273120ebb7bf651f6a61cab49f 100644
--- a/chromecast/browser/cast_browser_process.cc
+++ b/chromecast/browser/cast_browser_process.cc
@@ -18,10 +18,6 @@
 #include "components/crash/browser/crash_dump_manager_android.h"
 #endif  // defined(OS_ANDROID)
 
-#if defined(USE_AURA)
-#include "ui/aura/env.h"
-#endif
-
 namespace chromecast {
 namespace shell {
 
@@ -44,9 +40,6 @@ CastBrowserProcess::~CastBrowserProcess() {
   DCHECK_EQ(g_instance, this);
   if (pref_service_)
     pref_service_->CommitPendingWrite();
-#if defined(USE_AURA)
-  aura::Env::DeleteInstance();
-#endif
   g_instance = NULL;
 }