Unreviewed, rolling out r189338.

Unreviewed, rolling out r189338.
https://bugs.webkit.org/show_bug.cgi?id=148785

Caused tons of crashes (Requested by cdumez on #webkit).

Reverted changeset:

"Web Inspector: InspectorController should support multiple
frontend channels"
https://bugs.webkit.org/show_bug.cgi?id=148538
http://trac.webkit.org/changeset/189338

Patch by Commit Queue <commit-queue@webkit.org> on 2015-09-03

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@189340 268f45cc-cd09-0410-ab3c-d52691b4dbfc