honghaiz 5df5434cef Fix a type mistake
long in c++ is 32 bits. We need 64 bits here.

Review-Url: https://codereview.webrtc.org/2326253002
Cr-Commit-Position: refs/heads/master@{#14176}
2016-09-10 22:48:00 +00:00
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2016-09-10 22:48:00 +00:00