Update slaves.cfg for master.tryserver.libyuv
Update slaves.cfg for master.tryserver.libyuv

BUG=235768
TEST=Doublechecked build/masters/master.tryserver.unused/slaves.cfg
g

Review URL: https://chromiumcodereview.appspot.com/14670003

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@197527 0039d316-1c4b-4281-b951-d872f2087c98

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