Increase the rtccertificategenerator_unittest.cc certificate generation timeout to hopefully avoid a timeout flake on the bots.
Increase the rtccertificategenerator_unittest.cc certificate generation timeout
to hopefully avoid a timeout flake on the bots.

R=hta@webrtc.org

Review URL: https://codereview.webrtc.org/2012563003 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#12889}

ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc