aura: Require explicit ownership of the Env instance.

ash/test/test_suite.h

Index: ash/test/test_suite.h
diff --git a/ash/test/test_suite.h b/ash/test/test_suite.h
index 9540f835c9837e4cca7762a64e9b38b81b4b96c3..5f869f39cfa673ea3f3e1438c2ff7319208236ce 100644
--- a/ash/test/test_suite.h
+++ b/ash/test/test_suite.h
@@ -15,6 +15,10 @@
 #include "base/win/scoped_com_initializer.h"
 #endif
 
+namespace aura {
+class Env;
+}
+
 namespace ash {
 namespace test {
 
@@ -32,6 +36,7 @@ class AuraShellTestSuite : public base::TestSuite {
 #if defined(OS_WIN)
   std::unique_ptr<base::win::ScopedCOMInitializer> com_initializer_;
 #endif
+  std::unique_ptr<aura::Env> env_;
 
   base::TestDiscardableMemoryAllocator discardable_memory_allocator_;
 };