Enabled pressing TAB to cycle through the Omnibox results.

chrome/browser/ui/gtk/omnibox/omnibox_popup_view_gtk.cc

 // Copyright (c) 2011 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/gtk/omnibox/omnibox_popup_view_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 458 matching lines @@
   size_t line = std::max(y - kBorderThickness, 0) / kHeightPerResult;
   return std::min(line, model_->result().size() - 1);
 }
 
 void OmniboxPopupViewGtk::AcceptLine(size_t line,
                                      WindowOpenDisposition disposition) {
   // OpenMatch() may close the popup, which will clear the result set and, by
   // extension, |match| and its contents.  So copy the relevant match out to
   // make sure it stays alive until the call completes.
   AutocompleteMatch match = model_->result().match_at(line);
-  string16 keyword;
-  const bool is_keyword_hint = model_->GetKeywordForMatch(match, &keyword);
   omnibox_view_->OpenMatch(match, disposition, GURL(), line,
-                           is_keyword_hint ? string16() : keyword);
+                           match.keyword);
 }
 
 GdkPixbuf* OmniboxPopupViewGtk::IconForMatch(const AutocompleteMatch& match,
                                              bool selected) {
   const SkBitmap* bitmap = model_->GetIconIfExtensionMatch(match);
   if (bitmap) {
     if (!ContainsKey(pixbufs_, bitmap))
       pixbufs_[bitmap] = gfx::GdkPixbufFromSkBitmap(bitmap);
     return pixbufs_[bitmap];
   }
@@ skipping 188 matching lines @@
                           (text_width - actual_content_width -
                            (actual_description_width / PANGO_SCALE)),
                       content_y, layout_);
     }
   }
 
   g_object_unref(gc);
 
   return TRUE;
 }