Always broadcast one last "tab not blocked" notification before closing a tab.

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 1232 matching lines @@
     InternalCloseTab(closing_contents, index,
                      (close_types & CLOSE_CREATE_HISTORICAL_TAB) != 0);
   }
 
   return retval;
 }
 
 void TabStripModel::InternalCloseTab(WebContents* contents,
                                      int index,
                                      bool create_historical_tabs) {
+  // Reset the blocked state of the tab, and fire a notification if necessary.
+  // <http://crbug.com/336386#c4> . TODO(avi): Remove all the "blocked" code and
+  // the WebContentsModalDialogManager from TabStripModel, and move all that
+  // tracking code to the modal dialog code, where it belongs.
+  SetTabBlocked(index, false);
+
   FOR_EACH_OBSERVER(TabStripModelObserver, observers_,
                     TabClosingAt(this, contents, index));
 
   // Ask the delegate to save an entry for this tab in the historical tab
   // database if applicable.
   if (create_historical_tabs)
     delegate_->CreateHistoricalTab(contents);
 
   // Deleting the WebContents will call back to us via
   // WebContentsData::WebContentsDestroyed and detach it.
@@ skipping 134 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)->set_group(NULL);
     if ((*i)->opener() == tab)
       (*i)->set_opener(NULL);
   }
 }