Cleanup: remove redundant tab close observation from TabModalConfirmDialogDelegate

chrome/browser/ui/sync/one_click_signin_helper.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 "chrome/browser/ui/sync/one_click_signin_helper.h"
 
 #include <algorithm>
 #include <functional>
 #include <utility>
 #include <vector>
@@ skipping 399 matching lines @@
   TabModalConfirmDialog::Create(
       new ConfirmEmailDialogDelegate(contents, last_email, email,
                                      callback), contents);
 }
 
 ConfirmEmailDialogDelegate::ConfirmEmailDialogDelegate(
     content::WebContents* contents,
     const std::string& last_email,
     const std::string& email,
     Callback callback)
-  : TabModalConfirmDialogDelegate(contents),
-    last_email_(last_email),
+  : last_email_(last_email),
     email_(email),
     callback_(callback) {
 }
 
 ConfirmEmailDialogDelegate::~ConfirmEmailDialogDelegate() {
 }
 
 string16 ConfirmEmailDialogDelegate::GetTitle() {
   return l10n_util::GetStringUTF16(
       IDS_ONE_CLICK_SIGNIN_CONFIRM_EMAIL_DIALOG_TITLE);
@@ skipping 881 matching lines @@
                                         content::Referrer(),
                                         content::PAGE_TRANSITION_AUTO_TOPLEVEL,
                                         std::string());
     }
   }
 
   // Clear the redirect URL.
   redirect_url_ = GURL();
   sync_service->RemoveObserver(this);
 }