Disable pyauto tests causing browser crash in Debug builds

BUG=86456

R=phajdan.jr@chromium.org
TEST=

Review URL: http://codereview.chromium.org/7185029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89520 0039d316-1c4b-4281-b951-d872f2087c98