<http://build.webkit.org/results/SnowLeopard%20Intel%20Leaks/r47547%20(36)/DumpRenderTree2-leaks.txt> shows an instance of WebKit::HostedNetscapePluginStream and related data being leaked. It appears to happen during plugins/return-error-from-new-stream-callback-in-full-frame-plugin.html.
<rdar://problem/7156355>
Created attachment 35186 [details] Patch
Landed in r47551.