These functions were used in earlier DumpRenderTree mac port of WebKit project.
Please refer to <https://trac.webkit.org/changeset/19364> for details.

As DumpRenderTree has been removed in chromium project, these functions can be removed.
So this patch deletes those.

Review URL: https://chromiumcodereview.appspot.com/18097008

git-svn-id: svn://svn.chromium.org/blink/trunk@154211 bbb929c8-8fbe-4397-9dbb-9b2b20218538