Make repost form warning tab-modal on Mac.

chrome/browser/browser.cc

 // Copyright (c) 2010 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/browser.h"
 
 #include <algorithm>
 #include <string>
 
 #include "app/animation.h"
@@ skipping 2762 matching lines @@
 
   // Window management commands
   command_updater_.UpdateCommandEnabled(IDC_DUPLICATE_TAB,
       !(type() & TYPE_APP) && CanDuplicateContentsAt(selected_index()));
   command_updater_.UpdateCommandEnabled(IDC_SELECT_NEXT_TAB,
       !(type() & TYPE_APP) && tab_count() > 1);
   command_updater_.UpdateCommandEnabled(IDC_SELECT_PREVIOUS_TAB,
       !(type() & TYPE_APP) && tab_count() > 1);
 
   // Current navigation entry, may be NULL.
-  NavigationEntry* active_entry = current_tab->controller().GetActiveEntry();
+  NavigationEntry* active_entry = nc.GetActiveEntry();
 
   // Page-related commands
   window_->SetStarredState(current_tab->is_starred());
   command_updater_.UpdateCommandEnabled(IDC_BOOKMARK_ALL_TABS,
                                         CanBookmarkAllTabs());
 
   // View-source should not be enabled if already in view-source mode or
   // the source is not viewable.
   command_updater_.UpdateCommandEnabled(IDC_VIEW_SOURCE,
       current_tab->controller().CanViewSource());
@@ skipping 608 matching lines @@
     return;
 
   ExtensionsService* extension_service = profile()->GetExtensionsService();
   if (extension_service && extension_service->is_ready()) {
     Extension* extension =
         extension_service->GetExtensionById(app_extension_id, false);
     if (extension)
       contents->SetAppExtension(extension);
   }
 }