We can reduces the pool size of the ListHashSets used by Document.
<rdar://problem/7999388>
Created attachment 56413 [details] patch
Comment on attachment 56413 [details] patch r=me
Attachment 56413 [details] did not build on chromium: Build output: http://webkit-commit-queue.appspot.com/results/2280274
Landed in r59716.
Attachment 56413 [details] did not build on gtk: Build output: http://webkit-commit-queue.appspot.com/results/2268321