This compilation problem happen if you try to use libcurl as network backend because glib.h isn't included by libcurl headers.
I know the official and only one supported network backend for GTK port is libSoup, anyway it's a error to not directly include the glib header where using their types besides this help whom are doing tests with libcurl :-)
Created attachment 204539 [details]
Comment on attachment 204539 [details]
Clearing flags on attachment: 204539
Committed r151527: <http://trac.webkit.org/changeset/151527>
All reviewed patches have been landed. Closing bug.