LogDog: Enable for tryserver.chromium.mac.
LogDog: Enable for tryserver.chromium.mac.

BUG=chromium:550673
TEST=None

Review URL: https://codereview.chromium.org/1829633004

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@299482 0039d316-1c4b-4281-b951-d872f2087c98

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