Enabled pressing TAB to cycle through the Omnibox results.

chrome/browser/ui/gtk/omnibox/omnibox_popup_view_gtk.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/gtk/omnibox/omnibox_popup_view_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 461 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);
 }
 
 const gfx::Image* OmniboxPopupViewGtk::IconForMatch(
     const AutocompleteMatch& match, bool selected) {
   const SkBitmap* bitmap = model_->GetIconIfExtensionMatch(match);
   if (bitmap) {
     if (!ContainsKey(images_, bitmap)) {
       // gfx::Image wants ownership of bitmaps given to it, and we might as
       // well make the bitmap copy a format that will be used.
       images_[bitmap] = new gfx::Image(gfx::GdkPixbufFromSkBitmap(bitmap));
@@ skipping 194 matching lines @@
                      (actual_description_width / PANGO_SCALE)),
                     content_y);
       pango_cairo_show_layout(cr, layout_);
       cairo_restore(cr);
     }
   }
 
   cairo_destroy(cr);
   return TRUE;
 }