Endure Buildbot: Disable running against reference builds.
Endure Buildbot: Disable running against reference builds.

TBR=qyearsley@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23566002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@219756 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build