RenderLayer: Store reflection renderer in a RenderPtr.
<https://webkit.org/b/126273>
Reviewed by Anders Carlsson.
* rendering/RenderLayer.h:
* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::RenderLayer):
(WebCore::RenderLayer::calculateClipRects):
Turn RenderLayer::m_reflection into a RenderPtr<RenderReplica>
instead of a raw pointer.
* WebCore.xcodeproj/project.pbxproj:
Add RenderPtr.h to private headers.
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@161123
268f45cc-cd09-0410-ab3c-
d52691b4dbfc