MacViews: Implement Full Keyboard Access.

ui/views/window/dialog_client_view.cc

Index: ui/views/window/dialog_client_view.cc
diff --git a/ui/views/window/dialog_client_view.cc b/ui/views/window/dialog_client_view.cc
index 04f9b2fc4da6a9e56c6aebf774844afbe961c388..2c00eacac3abffa5dd7d8c423c4b824c2e33a31d 100644
--- a/ui/views/window/dialog_client_view.cc
+++ b/ui/views/window/dialog_client_view.cc
@@ -396,7 +396,13 @@ LabelButton* DialogClientView::CreateDialogButton(ui::DialogButton type) {
     button = new LabelButton(this, title);
     button->SetStyle(Button::STYLE_BUTTON);
   }
+
+#if !defined(OS_MACOSX)
   button->SetFocusable(true);
+#else
+  button->SetFocusable(false);
+  button->SetAccessibilityFocusable(true);
+#endif
 
   const int kDialogMinButtonWidth = 75;
   button->SetMinSize(gfx::Size(kDialogMinButtonWidth, 0));