Trim down tryserver blink slaves
Trim down tryserver blink slaves

Since they blink merge they're no longer on any CQs

BUG=

Review URL: https://codereview.chromium.org/1780293002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@299219 0039d316-1c4b-4281-b951-d872f2087c98

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