Remove ViEChannel::StartSend deadlock suppression.
Remove ViEChannel::StartSend deadlock suppression.

No longer lock-order inverting since RTP/RTCP modules are instantiated
on construction and no longer guarded by a separate lock.

BUG=webrtc:2999
R=stefan@webrtc.org

Review URL: https://codereview.webrtc.org/1347283004 .

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#10034}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 7cf04452622e8622151d8ab13a43daa437bb8ee1

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