Remove old perf code from nacl_commands.py.
Remove old perf code from nacl_commands.py.

BUG=158683

Review URL: https://codereview.chromium.org/156243005

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@249472 0039d316-1c4b-4281-b951-d872f2087c98

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