Small cosmetic change - simplify retry logic

Small cosmetic change - simplify retry logic

We can avoid redundant variables if we'll use standard
python's try-retry-fail construct.
Committed: http://src.chromium.org/viewvc/native_client?view=rev&revision=5215

[noelallen_use_chromium, 2011-05-04 23:49:33]

The change looks fine, but I'm not sure the comment makes sense.  The change
appears to raise instead of continue, in one re-try case (the other had it
already), and to explicitly print a FAILED message after 5 retries instead of
just implying it.

Not sure what you mean by redundant variable.  Otherwise,
LGTM