#relaunch-and-powerwash and #relaunch buttons are mutually exclusive.

BUG=318908
TEST=manual testing on Link

Review URL: https://codereview.chromium.org/84233004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236930 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236930