Convert //extensions/{common,shell} from scoped_ptr to std::unique_ptr

extensions/shell/test/shell_test.h

 // Copyright 2014 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 EXTENSIONS_SHELL_TEST_SHELL_TEST_H_
 #define EXTENSIONS_SHELL_TEST_SHELL_TEST_H_
 
-#include "base/memory/scoped_ptr.h"
+#include <memory>
+
 #include "content/public/test/browser_test.h"
 #include "content/public/test/browser_test_base.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace content {
 class BrowserContext;
 }
@@ skipping 16 matching lines @@
   content::BrowserContext* browser_context() { return browser_context_; }
 
  protected:
   content::BrowserContext* browser_context_;
   ShellExtensionSystem* extension_system_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_TEST_SHELL_TEST_H_