Deploy RenderPtr in RenderMathMLOperator::updateFromElement().
<https://webkit.org/b/126628>
Reviewed by Antti Koivisto.
* rendering/mathml/RenderMathMLOperator.cpp:
(WebCore::RenderMathMLOperator::updateFromElement):
Use RenderPtr/createRenderer for renderer creation.
Removed an unnecessary null check (text is always created.)
Also use RenderStyle::createAnonymousStyleWithDisplay()
helper to shorten down the code a bit.
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@161501
268f45cc-cd09-0410-ab3c-
d52691b4dbfc