Unreviewed, rolling out r169400.
https://bugs.webkit.org/show_bug.cgi?id=133338

Broke the iOS build in
LocalizedDateCache::calculateMaximumWidth() (Requested by smfr
on #webkit).

Reverted changeset:

"SVG TextRuns do not always get RenderingContexts"
https://bugs.webkit.org/show_bug.cgi?id=133198
http://trac.webkit.org/changeset/169400

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@169413 268f45cc-cd09-0410-ab3c-d52691b4dbfc