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Tracked requests are normally removed when the corresponding renderer
process dies.
However, it has been reported that this mechanism could be used to launch
a DoS attack against the browser process, resulting in "leaks".

This CL sets a limit of 1000 tracked gUM requests, which is a number
probably beyond what is practical for the webrtc-internals UI anyway.

Bug: 804440
Change-Id: I578fbb4ab6feee17f035beca2dbec86381376b6c
Reviewed-on: https://chromium-review.googlesource.com/926366
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Harald Alvestrand <hta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537850}