zhihuang 30e0da4a65 Change the type of session_id() from string to int64_t.
BUG=webrtc:7311

Review-Url: https://codereview.webrtc.org/2749493002
Cr-Commit-Position: refs/heads/master@{#17215}
2017-03-13 18:00:54 +00:00
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