Fix memory leaks in ChromeNotifierDelegateBrowserTest.*.

BUG=314040
R=dewittj@chromium.org

Review URL: https://codereview.chromium.org/55763003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232340 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232340