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

extensions/shell/browser/shell_desktop_controller_mac.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_BROWSER_SHELL_DESKTOP_CONTROLLER_MAC_H_
 #define EXTENSIONS_SHELL_BROWSER_SHELL_DESKTOP_CONTROLLER_MAC_H_
 
-#include "extensions/shell/browser/desktop_controller.h"
+#include <memory>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
+#include "extensions/shell/browser/desktop_controller.h"
 
 namespace extensions {
 
 class AppWindow;
 class AppWindowClient;
 
 // A simple implementation of the app_shell DesktopController for Mac Cocoa.
 // Only currently supports one app window (unlike Aura).
 class ShellDesktopControllerMac : public DesktopController {
  public:
   ShellDesktopControllerMac();
   ~ShellDesktopControllerMac() override;
 
   // DesktopController:
   gfx::Size GetWindowSize() override;
   AppWindow* CreateAppWindow(content::BrowserContext* context,
                              const Extension* extension) override;
   void AddAppWindow(gfx::NativeWindow window) override;
   void RemoveAppWindow(AppWindow* window) override;
   void CloseAppWindows() override;
 
  private:
-  scoped_ptr<AppWindowClient> app_window_client_;
+  std::unique_ptr<AppWindowClient> app_window_client_;
 
   // The desktop only supports a single app window.
   // TODO(yoz): Support multiple app windows, as we do in Aura.
   AppWindow* app_window_;  // NativeAppWindow::Close() deletes this.
 
   DISALLOW_COPY_AND_ASSIGN(ShellDesktopControllerMac);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_BROWSER_SHELL_DESKTOP_CONTROLLER_MAC_H_