Update SupportsUserData uses with unique_ptr.

ui/web_dialogs/web_dialog_ui.cc

 // Copyright (c) 2012 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 "ui/web_dialogs/web_dialog_ui.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/lazy_instance.h"
+#include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_message_handler.h"
 #include "content/public/common/bindings_policy.h"
 #include "ui/web_dialogs/web_dialog_delegate.h"
 
 using content::RenderFrameHost;
@@ skipping 33 matching lines @@
   // and the HTML dialogs won't swap WebUIs anyway since they don't navigate.
 }
 
 void WebDialogUI::CloseDialog(const base::ListValue* args) {
   OnDialogClosed(args);
 }
 
 // static
 void WebDialogUI::SetDelegate(content::WebContents* web_contents,
                               WebDialogDelegate* delegate) {
-  web_contents->SetUserData(&kWebDialogDelegateUserDataKey,
-                            new WebDialogDelegateUserData(delegate));
+  web_contents->SetUserData(
+      &kWebDialogDelegateUserDataKey,
+      base::MakeUnique<WebDialogDelegateUserData>(delegate));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Private:
 
 WebDialogDelegate* WebDialogUI::GetDelegate(
     content::WebContents* web_contents) {
   WebDialogDelegateUserData* user_data =
       static_cast<WebDialogDelegateUserData*>(
           web_contents->GetUserData(&kWebDialogDelegateUserDataKey));
@@ skipping 33 matching lines @@
   if (delegate) {
     std::string json_retval;
     if (args && !args->empty() && !args->GetString(0, &json_retval))
       NOTREACHED() << "Could not read JSON argument";
 
     delegate->OnDialogCloseFromWebUI(json_retval);
   }
 }
 
 }  // namespace ui