Remove perf step specification from chromeos_factory.py
Remove perf step specification from chromeos_factory.py

BUG=158683

Review URL: https://codereview.chromium.org/135153011

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@249230 0039d316-1c4b-4281-b951-d872f2087c98

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