Bug 586298 removed the only caller.
Created attachment 535272 [details] [diff] [review] Remove it
Comment on attachment 535272 [details] [diff] [review] Remove it Remove all the uses of sPtrsToPtrsToRelease inside nsContentUtils.cpp as well. r=me with that.
As visible in content/base/public/nsContentUtils.h and content/base/src/nsContentUtils.cpp, nsContentUtils::ReleasePtrOnShutdown and nsContentUtils::sPtrsToPtrsToRelease have been removed.