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This reverts commit d7d59c5b.

Reason for revert: virtual/webrtc-wpt-unified-plan/external/wpt/webrtc/RTCRtpSender-transport.https.html fails in "WebKit Linux Trusty MSAN".

Original change's description:
> Create RTCDtlsTransport objects in the blink layer
> 
> This CL does on-demand creation of blink-layer transport
> objects. It also introduces a way to get at the webrtc::PeerConnection
> object from the WebPeerConnectionHandler API.
> 
> Bug: chromium:907849
> Change-Id: Ic86a5a66289c31d1f939a47d58bc194c32471cbd
> Reviewed-on: https://chromium-review.googlesource.com/c/1358060
> Commit-Queue: Harald Alvestrand <hta@chromium.org>
> Reviewed-by: Guido Urdaneta <guidou@chromium.org>
> Reviewed-by: Henrik Boström <hbos@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#615072}

TBR=hta@chromium.org,haraken@chromium.org,hbos@chromium.org,guidou@chromium.org

Change-Id: Ie9c8d2e3dc5f97fc94ca5bf43cc30a9407d9fa4c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:907849
Reviewed-on: https://chromium-review.googlesource.com/c/1369719Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615115}