sakal 844d2b9670 Reconfigure capture session in a single transaction.
If we don't reconfigure capture session in a single transaction,
RTCCameraPreviewView goes transparent when switching cameras. This is
undesired behavior.

BUG=webrtc:7177

Review-Url: https://codereview.webrtc.org/2811643006
Cr-Commit-Position: refs/heads/master@{#17664}
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