Using --remove_unneeded_entities reduces size of QtWebkit.dll.sym from 1GB to 0.25GB. Patch follows
Created attachment 79642 [details] Patch
Comment on attachment 79642 [details] Patch LGTM, r+. Thanks.
Comment on attachment 79642 [details] Patch Clearing flags on attachment: 79642 Committed r76313: <http://trac.webkit.org/changeset/76313>
All reviewed patches have been landed. Closing bug.