Disabled and readonly search fields show the (x), allowing the user to remove the contents of the fields.
I suppose, also, with fields set with "result=#", that the drop-down should not be openable, or be openable, but the items are all disabled.
I am woefully misinformed. When comparing with the Mac user experience, disabled search fields still render the (x) but are not clickable. I notice that with ToT clicking on the (x) behaves as if the search field was editable--that is, it darkens when you click on it. Changing the name of the bug to focus on that.
Created attachment 121187 [details]
Committed r104332: http://trac.webkit.org/changeset/104332