> Switch to opt-out for toolchain
> 
> R=maruel@chromium.org
> BUG=323300
> 
> Review URL: https://codereview.chromium.org/174663005

TBR=scottmg@chromium.org

Review URL: https://codereview.chromium.org/175743002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@252634 0039d316-1c4b-4281-b951-d872f2087c98