Convert //base to use std::unique_ptr

base/callback_unittest.cc

Index: base/callback_unittest.cc
diff --git a/base/callback_unittest.cc b/base/callback_unittest.cc
index 1f492d42096e5ffe315aff47a695f87316c6dbc7..176ea0650ab6c9eb5664ed6ad23d3b821ad12634 100644
--- a/base/callback_unittest.cc
+++ b/base/callback_unittest.cc
@@ -2,12 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/bind.h"
 #include "base/callback.h"
+
+#include <memory>
+
+#include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/callback_internal.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {