Tear down service IPC channel before creating a new one.
Tear down service IPC channel before creating a new one.

BUG=74820
TEST=Start Chrome and enable Chromoting.  Restart Chromer and open Preferences, and check that Remoting is correctly detected as enabled.

Review URL: http://codereview.chromium.org/6612028

git-svn-id: http://src.chromium.org/svn/trunk/src@76903 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8638313d8d855f956898a43da8cf847e334a8eb1
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser