Convert //extensions/browser from scoped_ptr to std::unique_ptr

extensions/browser/mojo/keep_alive_impl_unittest.cc

Index: extensions/browser/mojo/keep_alive_impl_unittest.cc
diff --git a/extensions/browser/mojo/keep_alive_impl_unittest.cc b/extensions/browser/mojo/keep_alive_impl_unittest.cc
index 5d640e055d303d753b9a80931c0b8f94f419e888..4a6732d57277a88fb74b59a5af345d1235204d93 100644
--- a/extensions/browser/mojo/keep_alive_impl_unittest.cc
+++ b/extensions/browser/mojo/keep_alive_impl_unittest.cc
@@ -72,8 +72,8 @@ class KeepAliveTest : public ExtensionsTest {
   }
 
  private:
-  scoped_ptr<base::MessageLoop> message_loop_;
-  scoped_ptr<content::NotificationService> notification_service_;
+  std::unique_ptr<base::MessageLoop> message_loop_;
+  std::unique_ptr<content::NotificationService> notification_service_;
   scoped_refptr<const Extension> extension_;
 
   DISALLOW_COPY_AND_ASSIGN(KeepAliveTest);