Switch SupportsUserData uses to use unique_ptr.

chrome/browser/ui/cocoa/tab_dialogs_cocoa.mm

 // 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.
 
 #include "chrome/browser/ui/cocoa/tab_dialogs_cocoa.h"
 
 #include "base/memory/ptr_util.h"
 #import "chrome/browser/ui/cocoa/content_settings/collected_cookies_mac.h"
 #import "chrome/browser/ui/cocoa/hung_renderer_controller.h"
 #import "chrome/browser/ui/cocoa/passwords/passwords_bubble_cocoa.h"
 #import "chrome/browser/ui/cocoa/profiles/profile_signin_confirmation_dialog_cocoa.h"
 #include "chrome/browser/ui/cocoa/tab_dialogs_views_mac.h"
 #import "chrome/browser/ui/cocoa/validation_message_bubble_cocoa.h"
 #include "chrome/browser/ui/sync/profile_signin_confirmation_helper.h"
 #include "content/public/browser/web_contents.h"
 #include "ui/base/material_design/material_design_controller.h"
 
 // static
 void TabDialogs::CreateForWebContents(content::WebContents* contents) {
   DCHECK(contents);
 
   if (!FromWebContents(contents)) {
-    TabDialogs* tab_dialogs =
+    std::unique_ptr<TabDialogs> tab_dialogs =
         ui::MaterialDesignController::IsSecondaryUiMaterial()
-            ? new TabDialogsViewsMac(contents)
-            : new TabDialogsCocoa(contents);
-    contents->SetUserData(UserDataKey(), tab_dialogs);
+            ? base::MakeUnique<TabDialogsViewsMac>(contents)
+            : base::MakeUnique<TabDialogsCocoa>(contents);
+    contents->SetUserData(UserDataKey(), std::move(tab_dialogs));
   }
 }
 
 TabDialogsCocoa::TabDialogsCocoa(content::WebContents* contents)
     : web_contents_(contents) {
   DCHECK(contents);
 }
 
 TabDialogsCocoa::~TabDialogsCocoa() {
 }
@@ skipping 40 matching lines @@
   // The bubble is closed when it loses the focus.
 }
 
 base::WeakPtr<ValidationMessageBubble> TabDialogsCocoa::ShowValidationMessage(
     const gfx::Rect& anchor_in_root_view,
     const base::string16& main_text,
     const base::string16& sub_text) {
   return (new ValidationMessageBubbleCocoa(
       web_contents_, anchor_in_root_view, main_text, sub_text))->AsWeakPtr();
 }