https://bugs.webkit.org/show_bug.cgi?id=122421

Reviewed by Andreas Kling.

Replace uses of OwnPtr with std::unique_ptr and get rid of the ContentData::create overloads.

* css/StyleResolver.cpp:
(WebCore::StyleResolver::applyProperty):
* rendering/style/ContentData.cpp:
(WebCore::ContentData::clone):
* rendering/style/ContentData.h:
(WebCore::ContentData::setNext):
* rendering/style/RenderStyle.cpp:
(WebCore::RenderStyle::appendContent):
(WebCore::RenderStyle::setContent):
* rendering/style/RenderStyle.h:
* rendering/style/StyleRareNonInheritedData.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157005 268f45cc-cd09-0410-ab3c-d52691b4dbfc