Enabled pressing TAB to cycle through the Omnibox results.

chrome/browser/ui/views/omnibox/omnibox_view_views.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/views/omnibox/omnibox_view_views.h"
 
 #include "base/property_bag.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 221 matching lines @@
     if (model_->popup_model()->IsOpen())
       model_->popup_model()->TryDeletingCurrentItem();
   } else if (!handled && event.key_code() == ui::VKEY_UP) {
     model_->OnUpOrDownKeyPressed(-1);
     handled = true;
   } else if (!handled && event.key_code() == ui::VKEY_DOWN) {
     model_->OnUpOrDownKeyPressed(1);
     handled = true;
   } else if (!handled &&
              event.key_code() == ui::VKEY_TAB &&
-             !event.IsShiftDown() &&
              !event.IsControlDown()) {
-    if (model_->is_keyword_hint()) {
+    if (model_->is_keyword_hint() && !event.IsShiftDown()) {
       handled = model_->AcceptKeyword();
+    } else if (model_->popup_model()->IsOpen()) {
+      if (event.IsShiftDown() &&
+          model_->popup_model()->selected_line_state() ==
+              AutocompletePopupModel::KEYWORD) {
+        model_->ClearKeyword(GetText());
+      } else {
+        model_->OnUpOrDownKeyPressed(event.IsShiftDown() ? -1 : 1);
+      }
+      handled = true;
     } else {
       string16::size_type start = 0;
       string16::size_type end = 0;
       size_t length = GetTextLength();
       GetSelectionBounds(&start, &end);
       if (start != end || start < length) {
         OnBeforePossibleChange();
         textfield_->SelectRange(ui::Range(length, length));
         OnAfterPossibleChange();
         handled = true;
@@ skipping 554 matching lines @@
   OmniboxViewViews* omnibox_view = new OmniboxViewViews(controller,
                                                         toolbar_model,
                                                         profile,
                                                         command_updater,
                                                         popup_window_mode,
                                                         location_bar);
   omnibox_view->Init();
   return omnibox_view;
 }
 #endif