Fix for crbug/310432 Tab Capture Indicator stays on after MediaStream is stopped

BUG=310432
TEST = please see repro step in the defect.

Review URL: https://codereview.chromium.org/39853002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230719 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230719