Cleanup: remove redundant tab close observation from TabModalConfirmDialogDelegate

chrome/browser/ui/tab_modal_confirm_dialog_delegate.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/tab_modal_confirm_dialog_delegate.h"
 
-#include "chrome/browser/chrome_notification_types.h"
-#include "content/public/browser/navigation_controller.h"
-#include "content/public/browser/notification_source.h"
-#include "content/public/browser/web_contents.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
-using content::NavigationController;
 using content::WebContents;
 
-TabModalConfirmDialogDelegate::TabModalConfirmDialogDelegate(
-    WebContents* web_contents)
+TabModalConfirmDialogDelegate::TabModalConfirmDialogDelegate()
     : operations_delegate_(NULL),
       closing_(false) {
-  NavigationController* controller = &web_contents->GetController();
-  registrar_.Add(this, chrome::NOTIFICATION_TAB_CLOSING,
-                 content::Source<NavigationController>(controller));
 }
 
 TabModalConfirmDialogDelegate::~TabModalConfirmDialogDelegate() {
   // If we end up here, the window has been closed, so make sure we don't close
   // it again.
   operations_delegate_ = NULL;
   // Make sure everything is cleaned up.
   Cancel();
 }
 
@@ skipping 20 matching lines @@
 void TabModalConfirmDialogDelegate::LinkClicked(
     WindowOpenDisposition disposition) {
   if (closing_)
     return;
   // Make sure we won't do anything when another action occurs.
   closing_ = true;
   OnLinkClicked(disposition);
   CloseDialog();
 }
 
-void TabModalConfirmDialogDelegate::Observe(
-    int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-  // Close the dialog if the tab is closed.
-  if (type == chrome::NOTIFICATION_TAB_CLOSING) {
-    Cancel();
-  } else {
-    NOTREACHED();
-  }
-}
-
 gfx::Image* TabModalConfirmDialogDelegate::GetIcon() {
   return NULL;
 }
 
 string16 TabModalConfirmDialogDelegate::GetAcceptButtonTitle() {
   return l10n_util::GetStringUTF16(IDS_OK);
 }
 
 string16 TabModalConfirmDialogDelegate::GetCancelButtonTitle() {
   return l10n_util::GetStringUTF16(IDS_CANCEL);
@@ skipping 18 matching lines @@
 }
 
 void TabModalConfirmDialogDelegate::OnLinkClicked(
     WindowOpenDisposition disposition) {
 }
 
 void TabModalConfirmDialogDelegate::CloseDialog() {
   if (operations_delegate_)
     operations_delegate_->CloseDialog();
 }