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MediaStreams added to an RTCPeerConnection using the legacy addStream()
API is wired up such that the RTCPeerConnection is informed when tracks
are added or removed from the MediaStream so that the corresponding
sender can be added/removed from the PC.

OnStreamAddTrack/OnStreamRemoveTrack was wired up to call addTrack() and
removeTrack(), the crash occurred if these operations were to throw an
exception even though we just want to suppress any exceptions thrown.
The ExceptionState is updated to allow an exception to be thrown before
being cleared. This fixes the referenced bug.

Bug: 814139
Change-Id: I7798d7cf43bb71d42b7b8108f40ffba36dc95946
Reviewed-on: https://chromium-review.googlesource.com/992321Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547754}