Replace scoped_ptr with std::unique_ptr in //ui

ui/aura/test/aura_test_base.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_AURA_TEST_AURA_TEST_BASE_H_
 #define UI_AURA_TEST_AURA_TEST_BASE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 31 matching lines @@
 
   Window* root_window() { return helper_->root_window(); }
   WindowTreeHost* host() { return helper_->host(); }
   ui::EventProcessor* event_processor() { return helper_->event_processor(); }
   TestScreen* test_screen() { return helper_->test_screen(); }
 
  private:
   bool setup_called_;
   bool teardown_called_;
   base::MessageLoopForUI message_loop_;
-  scoped_ptr<AuraTestHelper> helper_;
+  std::unique_ptr<AuraTestHelper> helper_;
 
   DISALLOW_COPY_AND_ASSIGN(AuraTestBase);
 };
 
 }  // namespace test
 }  // namespace aura
 
 #endif  // UI_AURA_TEST_AURA_TEST_BASE_H_