Small cosmetic change - simplify retry logic

We can avoid redundant variables if we'll use standard
python's try-retry-fail construct.
Review URL: http://codereview.chromium.org/6880339

git-svn-id: svn://svn.chromium.org/native_client/trunk/src/third_party@5215 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2
10 files changed