Text Autosizing: simplify and clean-up preOrderTraversal skipping containers
https://bugs.webkit.org/show_bug.cgi?id=107446

Patch by Tim Volodine <timvolodine@chromium.org> on 2013-01-26
Reviewed by Julien Chaffraix.

Simplify nextInPreOrderSkippingDescendantsOfContainers implementation
using RenderObject tree traversal methods.

No new tests because functionality is unchanged.

* rendering/TextAutosizer.cpp:
(WebCore::TextAutosizer::nextInPreOrderSkippingDescendantsOfContainers):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140913 268f45cc-cd09-0410-ab3c-d52691b4dbfc