Inherits RareData struct from FastAllocBase because it has been instantiated by 'new' in WebCore/css/CSSSelector.h:259.
Created attachment 42023 [details] proposed patch
Comment on attachment 42023 [details] proposed patch For any of these there is no need to be copyable, it may be more appropriate to inherit from Noncopyable than from FastAllocBase. This is one of those examples.
Created attachment 42086 [details] updated to Noncopyable
Landed in 50274. https://trac.webkit.org/changeset/50274