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Made OAuth token verification and user seession cookie retrieval process robust on transient network errors. If it fails, this part of the authentication process will retry up to 5 times when we detect that we are online.

BUG=chromium-os:18859, chromium-os:21633
TEST=see the bug

Review URL: http://codereview.chromium.org/8586007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110667 0039d316-1c4b-4281-b951-d872f2087c98