danilchap 42ca68ab72 Ensure one does not register same rtp header extension with different id
Added assert to RtpHeaderExtensionMap
Altered tests that did.

BUG=webrtc:1994

Review-Url: https://codereview.webrtc.org/2462663002
Cr-Commit-Position: refs/heads/master@{#14840}
2016-10-31 10:34:45 +00:00
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