Disable using Swarming for linux. The linux swarming slaves are broken. All comments about enabling/disabling Swarming usage. Fix one variable aliasing. [email protected] BUG= Review URL: https://codereview.chromium.org/26248005 git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/commit-queue@227509 0039d316-1c4b-4281-b951-d872f2087c98