Revert 32626 - Remove the expiration check from Chrome code
Revert 32626 - Remove the expiration check from Chrome code

BUG= http://code.google.com/p/nativeclient/issues/detail?id=119
TEST=none

Review URL: http://codereview.chromium.org/410004

TBR=gregoryd@google.com
Review URL: http://codereview.chromium.org/418013

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@32628 0039d316-1c4b-4281-b951-d872f2087c98

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