Web Inspector: pass explicit agent references to InspectorBackendDispatcher. The dispatcher should exists only when frontend is connected to the backend as in other moments we don't expect any messages to be sent to the backend.
Created attachment 84856 [details] Patch
Created attachment 84857 [details] Patch
Created attachment 85164 [details] Patch
Committed r80640: <http://trac.webkit.org/changeset/80640>