Honghai Zhang 161a586b45 Fix some flaky tests by using longer timeout and/or fake clock.
Also use const variables for timeout values.

BUG=webrtc:6500
R=deadbeef@webrtc.org

Review URL: https://codereview.webrtc.org/2431473004 .

Cr-Commit-Position: refs/heads/master@{#14711}
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