DevTools: Simplify FrameFetchContext::sendRemainingDelegateMessages now that mos tof the parameters are actually zeros.

R=caseq, pfeldman

Review URL: https://codereview.chromium.org/108183002

git-svn-id: svn://svn.chromium.org/blink/trunk@163358 bbb929c8-8fbe-4397-9dbb-9b2b20218538