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The webrtc bots don't specify a default filter and are broken since
https://crrev.com/c/2198780 landed. Provide one default identity to
fix them until the webrtc bot have been configured to set a filter.

Bug: 1085056, webrtc:11591
Change-Id: I67cdff9698cfd1de1d0f83bf7045e38508367bc9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210249
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770687}