aura: Require explicit ownership of the Env instance.

content/public/test/unittest_test_suite.h

Index: content/public/test/unittest_test_suite.h
diff --git a/content/public/test/unittest_test_suite.h b/content/public/test/unittest_test_suite.h
index a6be2fa60836b7d4a5a1d4d2a0ea83e39ce3a106..1b97eb9bceb5fdcc85a131bb30003205d622f111 100644
--- a/content/public/test/unittest_test_suite.h
+++ b/content/public/test/unittest_test_suite.h
@@ -10,6 +10,12 @@
 #include "base/macros.h"
 #include "build/build_config.h"
 
+#if defined(USE_AURA)
+namespace aura {
+class Env;
+}
+#endif
+
 namespace base {
 class TestSuite;
 }
@@ -34,6 +40,9 @@ class UnitTestTestSuite {
   std::unique_ptr<base::TestSuite> test_suite_;
 
   std::unique_ptr<TestBlinkWebUnitTestSupport> blink_test_support_;
+#if defined(USE_AURA)
+  std::unique_ptr<aura::Env> env_;
+#endif
 
   DISALLOW_COPY_AND_ASSIGN(UnitTestTestSuite);
 };