Convert one deferredGenerator to inlineCallbacks in try_job_rietveld.py.
Convert one deferredGenerator to inlineCallbacks in try_job_rietveld.py.

inlineCallbacks requires python 2.5 but we require 2.6 now. inlineCallbacks is
significantly shorter than deferredGenerator.

This CL is mostly an experimentation to make sure I'm doing it right. Afterward
I'll debug why Rietveld fails on updating on exception.

R=petermayo@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/11818047

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@177446 0039d316-1c4b-4281-b951-d872f2087c98

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