remove RtcEventLog factory function that relies on GlobalTaskQueueFactory, move that default behaviour up to RtcEventLogFactory level. Bug: webrtc:10284 Change-Id: I512d8a13e6a2f320000dd08e6355c0a7e9de8561 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/132542 Reviewed-by: Björn Terelius <terelius@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27573}