aura: Require explicit ownership of the Env instance.

ui/views/mus/aura_init.h

Index: ui/views/mus/aura_init.h
diff --git a/ui/views/mus/aura_init.h b/ui/views/mus/aura_init.h
index 521acac91ee31267edf26c4a2d40cacfdab4fcd8..8e9e58aa6a6fc0cee2b1f9de08570e8e0940a1d6 100644
--- a/ui/views/mus/aura_init.h
+++ b/ui/views/mus/aura_init.h
@@ -5,6 +5,7 @@
 #ifndef UI_VIEWS_MUS_AURA_INIT_H_
 #define UI_VIEWS_MUS_AURA_INIT_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
@@ -13,6 +14,10 @@
 #include "skia/ext/refptr.h"
 #include "ui/views/mus/mus_export.h"
 
+namespace aura {
+class Env;
+}
+
 namespace font_service {
 class FontLoader;
 }
@@ -40,6 +45,7 @@ class VIEWS_MUS_EXPORT AuraInit {
 
   const std::string resource_file_;
 
+  std::unique_ptr<aura::Env> env_;
   scoped_ptr<ViewsDelegate> views_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(AuraInit);