Quickly close tabs/window with long-running unload handlers.

chrome/browser/ui/tabs/tab_strip_model.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/tabs/tab_strip_model.h"
 
 #include <algorithm>
 #include <map>
 #include <string>
 
@@ skipping 261 matching lines @@
     // notification is sent even though the tab selection has changed because
     // |old_model| is stored after calling DecrementFrom().
     if (was_selected) {
       FOR_EACH_OBSERVER(TabStripModelObserver, observers_,
                         TabSelectionChanged(this, old_model));
     }
   }
   return removed_contents;
 }
 
+TabContents* TabStripModel::DetachTabContentsAndCreateHistoryAt(int index) {
+  TabContents* contents = DetachTabContentsAt(index);
+  if (contents)
+    delegate_->CreateHistoricalTab(contents->web_contents());
+  return contents;
+}
+
 void TabStripModel::ActivateTabAt(int index, bool user_gesture) {
   DCHECK(ContainsIndex(index));
   TabStripSelectionModel new_model;
   new_model.Copy(selection_model_);
   new_model.SetSelectedIndex(index);
   SetSelection(new_model, user_gesture ? NOTIFY_USER_GESTURE : NOTIFY_DEFAULT);
 }
 
 void TabStripModel::AddTabAtToSelection(int index) {
   DCHECK(ContainsIndex(index));
@@ skipping 1009 matching lines @@
 void TabStripModel::ForgetOpenersAndGroupsReferencing(
     const WebContents* tab) {
   for (WebContentsDataVector::const_iterator i = contents_data_.begin();
        i != contents_data_.end(); ++i) {
     if ((*i)->group == tab)
       (*i)->group = NULL;
     if ((*i)->opener == tab)
       (*i)->opener = NULL;
   }
 }