Enabled pressing TAB to cycle through the Omnibox results.

chrome/browser/ui/omnibox/omnibox_view.h

 // 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.
 
 // This file defines the interface class OmniboxView.  Each toolkit will
 // implement the edit view differently, so that code is inherently platform
 // specific.  However, the AutocompleteEditModel needs to do some communication
 // with the view.  Since the model is shared between platforms, we need to
 // define an interface that all view implementations will share.
 
@@ skipping 91 matching lines @@
   // The user text is the text the user has manually keyed in.  When present,
   // this is shown in preference to the permanent text; hitting escape will
   // revert to the permanent text.
   virtual void SetUserText(const string16& text) = 0;
   virtual void SetUserText(const string16& text,
                            const string16& display_text,
                            bool update_popup) = 0;
 
   // Sets the window text and the caret position.
   virtual void SetWindowTextAndCaretPos(const string16& text,
-                                        size_t caret_pos) = 0;
+                                        size_t caret_pos,
+                                        bool update_popup,
+                                        bool notify_text_changed) = 0;
 
   // Sets the edit to forced query mode.  Practically speaking, this means that
   // if the edit is not in forced query mode, its text is set to "?" with the
   // cursor at the end, and if the edit is in forced query mode (its first
   // non-whitespace character is '?'), the text after the '?' is selected.
   //
   // In the future we should display the search engine UI for the default engine
   // rather than '?'.
   virtual void SetForcedQuery() = 0;
 
@@ skipping 92 matching lines @@
 #endif
 
   // Returns a string with any leading javascript schemas stripped from the
   // input text.
   static string16 StripJavascriptSchemas(const string16& text);
 
   virtual ~OmniboxView() {}
 };
 
 #endif  // CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_VIEW_H_