Update a comment that mentions the nonexistent Reset() method.
Update a comment that mentions the nonexistent Reset() method.

R=henrika@webrtc.org, phoglund@webrtc.org, niklas.enbom@webrtc.org
BUG=none
TEST=none

Review URL: https://webrtc-codereview.appspot.com/56539004

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#9332}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 5a8bad60cae439685c10d98b767c8dc04f35195c

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc