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Also fix an issue with missing constriants logged at webrtc-internals.

See a snapshot of the UI at https://docs.google.com/a/google.com/presentation/d/1dL2flqsQj8h_dTO9t8BWOCjiwbLiZCN2Nt93FHqpM9o/edit?usp=sharing

BUG=304023

Review URL: https://codereview.chromium.org/405683003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284545 0039d316-1c4b-4281-b951-d872f2087c98