DennyZhang 23178a997a add assertions for blind grep
blind grep is error-prone.
Add assertions for errors we can not handle

Change-Id: Ibe19085545ecc848498506e8b8ee14e71825b273
2013-10-22 17:12:18 -05:00
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2013-10-22 17:12:18 -05:00
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