Only try keyring password once for code.google.com

Only try keyring password once for code.google.com

If the keyring password doesn't work on the first try, it probably won't
work on the second or third. The KeyringCreds object already supports
this, we just were recreating the object at each step.

Also, if after three tries authentication to code.google.com still
fails, then the script should continue and just use un-authenticated
access to code.google.com.

BUG=158388
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=165446

[cjhopman, 2012-11-01 18:43:19]

cmp: for depot_tools owners

[cmp, 2012-11-01 18:48:32]

lgtm

[commit-bot: I haz the power, 2012-11-01 18:50:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/cjhopman@chromium.org/11340023/1

[commit-bot: I haz the power, 2012-11-01 18:53:14]

Change committed as 165446