Revert of aura: Require explicit ownership of the Env instance.

ui/aura/test/aura_test_helper.h

Index: ui/aura/test/aura_test_helper.h
diff --git a/ui/aura/test/aura_test_helper.h b/ui/aura/test/aura_test_helper.h
index 42fc8d8ce6d8e6cdea5270906eefbe80d0ce2eeb..0cdaf3e7b4a657bb7685f79b63ccf782a4fed4c4 100644
--- a/ui/aura/test/aura_test_helper.h
+++ b/ui/aura/test/aura_test_helper.h
@@ -9,10 +9,6 @@
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/aura/window_tree_host.h"
-
-namespace aura {
-class Env;
-}
 
 namespace base {
 class MessageLoopForUI;
@@ -61,7 +57,7 @@
   base::MessageLoopForUI* message_loop_;
   bool setup_called_;
   bool teardown_called_;
-  scoped_ptr<aura::Env> env_;
+  bool env_created_;
   scoped_ptr<WindowTreeHost> host_;
   scoped_ptr<TestWindowTreeClient> stacking_client_;
   scoped_ptr<client::DefaultCaptureClient> capture_client_;