Fix crash in layout tests due to my previous network delegate change (r79905).
Fix crash in layout tests due to my previous network delegate change (r79905).

AddRef the delegate_callback before any early returns, since it will be
Released in DoBuildRequestComplete.

BUG=webkit/57539
TEST=no
TBR=willchan

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@80114 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser