First pass at experimental omnibox API. There are plenty of rough edges and

chrome/browser/search_engines/template_url_table_model.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/search_engines/template_url_table_model.h"
 
 #include <vector>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 141 matching lines @@
   }
 
   last_search_engine_index_ = static_cast<int>(entries_.size());
 
   // Then the rest.
   for (std::vector<const TemplateURL*>::iterator i = urls.begin();
        i != urls.end(); ++i) {
     const TemplateURL* template_url = *i;
     // NOTE: we don't use ShowInDefaultList here to avoid things bouncing
     // the lists while editing.
-    if (!template_url->show_in_default_list())
+    if (!template_url->show_in_default_list() &&
+        !template_url->IsExtensionKeyword())
       entries_.push_back(new ModelEntry(this, *template_url));
   }
 
   if (observer_)
     observer_->OnModelChanged();
 }
 
 int TemplateURLTableModel::RowCount() {
   return static_cast<int>(entries_.size());
 }
@@ skipping 187 matching lines @@
 void TemplateURLTableModel::FavIconAvailable(ModelEntry* entry) {
   std::vector<ModelEntry*>::iterator i =
       find(entries_.begin(), entries_.end(), entry);
   DCHECK(i != entries_.end());
   NotifyChanged(static_cast<int>(i - entries_.begin()));
 }
 
 void TemplateURLTableModel::OnTemplateURLModelChanged() {
   Reload();
 }