Enabled pressing TAB to cycle through the Omnibox results.

chrome/browser/autocomplete/autocomplete_edit_view_views.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/autocomplete/autocomplete_edit_view_views.h"
 
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
@@ skipping 173 matching lines @@
     // the contents of omnibox2, we notify the AutocompleteEditModel class when
     // the control-key state is changed.
     model_->OnControlKeyChanged(true);
   } else if (!handled && event.key_code() == ui::VKEY_DELETE &&
              event.IsShiftDown()) {
     // If shift+del didn't change the text, we let this delete an entry from
     // the popup.  We can't check to see if the IME handled it because even if
     // nothing is selected, the IME or the TextView still report handling it.
     if (model_->popup_model()->IsOpen())
       model_->popup_model()->TryDeletingCurrentItem();
   } else if (!handled && event.key_code() == ui::VKEY_UP) {

[Peter Kasting, 2011/04/01 00:09:09]

You need to rework this function in a similar way to the Windows changes.

     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()) {
-      handled = model_->AcceptKeyword();
+      handled = model_->AcceptKeyword(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();
         SelectRange(length, length);
         OnAfterPossibleChange();
         handled = true;
@@ skipping 427 matching lines @@
 AutocompletePopupView* AutocompleteEditViewViews::CreatePopupView(
     Profile* profile,
     const View* location_bar) {
 #if defined(TOUCH_UI)
   return new TouchAutocompletePopupContentsView(
 #else
   return new AutocompletePopupContentsView(
 #endif
       gfx::Font(), this, model_.get(), profile, location_bar);
 }