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Also moved the translation from default sdp semantics and its counter
to the PeerConnection from the handler.

Bug: 787254
Change-Id: Iea26f6500ebcdfdeb862596861580b21c9eba903
Reviewed-on: https://chromium-review.googlesource.com/1177754Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Florent Castelli <orphis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584713}