Disable clustering on the ThreadSanitizer bots. Per Sergey's suggestion use a list to handle extra_sharding_args while manipulating them.
Disable clustering on the ThreadSanitizer bots.
Per Sergey's suggestion use a list to handle extra_sharding_args while manipulating them.

R=maruel@chromium.org
BUG=128314

Review URL: https://codereview.chromium.org/23819056

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@223323 0039d316-1c4b-4281-b951-d872f2087c98

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