Convert //chrome/browser/ui from scoped_ptr to std::unique_ptr

chrome/browser/ui/cocoa/tab_dialogs_cocoa.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 CHROME_BROWSER_UI_COCOA_TAB_DIALOGS_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_TAB_DIALOGS_COCOA_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/tab_dialogs.h"
 
 // Cocoa implementation of TabDialogs interface.
 class TabDialogsCocoa : public TabDialogs {
  public:
   explicit TabDialogsCocoa(content::WebContents* contents);
   ~TabDialogsCocoa() override;
 
   // TabDialogs:
   gfx::NativeView GetDialogParentView() const override;
   void ShowCollectedCookies() override;
   void ShowHungRendererDialog() override;
   void HideHungRendererDialog() override;
   void ShowProfileSigninConfirmation(
       Browser* browser,
       Profile* profile,
       const std::string& username,
       ui::ProfileSigninConfirmationDelegate* delegate) override;
   void ShowManagePasswordsBubble(bool user_action) override;
   void HideManagePasswordsBubble() override;
-  scoped_ptr<ValidationMessageBubble> ShowValidationMessage(
+  std::unique_ptr<ValidationMessageBubble> ShowValidationMessage(
       const gfx::Rect& anchor_in_root_view,
       const base::string16& main_text,
       const base::string16& sub_text) override;
 
  private:
   content::WebContents* web_contents_;  // Weak. Owns this.
 
   DISALLOW_COPY_AND_ASSIGN(TabDialogsCocoa);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_TAB_DIALOGS_COCOA_H_