To prevent Shill Service DBus ObjectProxy instances from accumulating,
remove them when the service becomes inactive.
Hopefully includes ASAN fixes.
BUG=223483
TBR=hashimoto@chromium.org
Review URL: https://codereview.chromium.org/26289002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227371 0039d316-1c4b-4281-b951-d872f2087c98