ParsedRtcEventLog::ParseStream was using a stack-allocated 64kb array
for a temporary buffer. This was causing problems in build environments
with restrictions on stack size.
This change replaces it with an std::vector.
NOTRY=true
Review-Url: https://codereview.webrtc.org/2297343003
Cr-Commit-Position: refs/heads/master@{#14055}