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We are deprecating label() and moving to using id() for consistency and
spec compliance. This is part of the effort to support to multiple media
stream ids in webrtc.

Bug: webrtc:8977
Change-Id: Iab6a8930f26d4c00a3a5153dd1cac85b3b4b5730
Reviewed-on: https://chromium-review.googlesource.com/953165Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Seth Hampson <shampson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542292}