Fix r207433 where I didn't upload the code I had in my checkout.
Fix r207433 where I didn't upload the code I had in my checkout.

It was "Partially revert r207044 "Stop deleting yielded data ..."" but the code
was improperly doing 'del i', which will make the caller blow up.

R=iannucci@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/17366008

git-svn-id: 8fa0a038c61565a87d0885d584517a2e12819dac@207492 0039d316-1c4b-4281-b951-d872f2087c98

pombreda/swarming,madecoste/swarming,madecoste/swarming,pombreda/swarming,madecoste/swarming,pombreda/swarming,luci/luci-py,madecoste/swarming,luci/luci-py,luci/luci-py,luci/luci-py,pombreda/swarming