[Mac] Don't handle up/down-arrow unless popup is visible.

chrome/browser/autocomplete/autocomplete_edit_view_mac.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_EDIT_VIEW_MAC_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_EDIT_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
@@ skipping 69 matching lines @@
                                            bool save_original_selection);
   virtual bool OnInlineAutocompleteTextMaybeChanged(
       const std::wstring& display_text, size_t user_text_length);
   virtual void OnRevertTemporaryText();
   virtual void OnBeforePossibleChange();
   virtual bool OnAfterPossibleChange();
 
   // Helper functions for use from AutocompleteEditHelper Objective-C
   // class.
 
+  // Returns true if |popup_view_| is open.
+  bool IsPopupOpen() const;
+
   // Trivial wrappers forwarding to |model_| methods.
   void OnControlKeyChanged(bool pressed);
   void OnEscapeKeyPressed();
   void OnUpOrDownKeyPressed(bool up, bool by_page);
 
   // Called when editing begins in the field, and before the results
   // of any editing are communicated to |model_|.
   void OnWillBeginEditing();
 
   // Called when editing ends in the field.
@@ skipping 64 matching lines @@
 
   // Tracking state before and after a possible change for reporting
   // to model_.
   NSRange selection_before_change_;
   std::wstring text_before_change_;
 
   DISALLOW_COPY_AND_ASSIGN(AutocompleteEditViewMac);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_EDIT_VIEW_MAC_H_