Replace WebNonCopyable with DISALLOW_COPY_AND_ASSIGN in test runner library

BUG=331298
R=battre@chromium.org

Review URL: https://codereview.chromium.org/123243002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242873 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242873