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Instead of using a whitelist, which is how non-standard stats objects
are being filtered out, this uses an "is_standardized" method on
RTCStatsMemberInterface.

This will allow us to easily add non-standard stats to WebRTC (or mark
previously non-standardized stats as standardized) without needing to
update chromium as well every time.

Follow up to:
https://webrtc-review.googlesource.com/c/src/+/83743

Bug: webrtc:9410
Change-Id: Idd349fedf30aa15db7c6e101115a1171aef33b4f
Reviewed-on: https://chromium-review.googlesource.com/1121319Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571861}