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

extensions/browser/app_window/test_app_window_contents.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_BROWSER_APP_WINDOW_TEST_APP_WINDOW_CONTENTS_
 #define EXTENSIONS_BROWSER_APP_WINDOW_TEST_APP_WINDOW_CONTENTS_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 18 matching lines @@
                   const GURL& url) override;
   void LoadContents(int32_t creator_process_id) override;
   void NativeWindowChanged(NativeAppWindow* native_app_window) override;
   void NativeWindowClosed() override;
   void DispatchWindowShownForTests() const override;
   void OnWindowReady() override;
   content::WebContents* GetWebContents() const override;
   WindowController* GetWindowController() const override;
 
  private:
-  scoped_ptr<content::WebContents> web_contents_;
+  std::unique_ptr<content::WebContents> web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(TestAppWindowContents);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_APP_WINDOW_TEST_APP_WINDOW_CONTENTS_