Clicking on the cancel button on readonly and disabled search fields darkens as if...

Clicking on the cancel button on readonly and disabled search fields darkens as if the search field was editable
https://bugs.webkit.org/show_bug.cgi?id=69886
<rdar://problem/10070187>

Reviewed by Adele Peterson.

.:

* ManualTests/search-cancel-button.html: Added.

Source/WebCore:

Tests: ManualTests/search-cancel-button.html

* rendering/RenderThemeMac.mm:
(WebCore::RenderThemeMac::paintSearchFieldCancelButton): If the input is readonly and/or disabled, force the cell to
render without highlight.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@104332 268f45cc-cd09-0410-ab3c-d52691b4dbfc