Enabled pressing TAB to cycle through the Omnibox results.

chrome/browser/autocomplete/autocomplete_edit.h

Index: chrome/browser/autocomplete/autocomplete_edit.h
===================================================================
--- chrome/browser/autocomplete/autocomplete_edit.h	(revision 79782)
+++ chrome/browser/autocomplete/autocomplete_edit.h	(working copy)
@@ -263,8 +263,9 @@
   bool is_keyword_hint() const { return is_keyword_hint_; }
 
   // Accepts the current keyword hint as a keyword. It always returns true for
-  // caller convenience.
-  bool AcceptKeyword();
+  // caller convenience. |update_result| should be false to accept the
+  // keyword in place without updating the result.
+  bool AcceptKeyword(bool update_result);
 
   // Clears the current keyword.  |visible_text| is the (non-keyword) text
   // currently visible in the edit.
@@ -518,6 +519,9 @@
   // keyword_ to show a "Press <tab> to search" sort of hint.
   bool is_keyword_hint_;
 
+  // True if the current possible change shouldn't change results
+  bool result_frozen_;
+
   // Paste And Go-related state.  See CanPasteAndGo().
   mutable GURL paste_and_go_url_;
   mutable PageTransition::Type paste_and_go_transition_;