Disable new maps benchmark. It is failing on Linux. Not sure about other bots.

http://build.chromium.org/p/chromium.perf/builders/Linux%20Perf%20%285%29/builds/875/steps/maps/logs/stdio

TBR=bajones@chromium.org,dtu@chromium.org
BUG=
NOTRY=True

Review URL: https://codereview.chromium.org/75323005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235901 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235901