Remove stringstreams from sdp parsing.
Remove stringstreams from sdp parsing.

Bug: webrtc:8982
Change-Id: Id5e8aa22794206864c8ce4b1ba155e49606a1b2d
Reviewed-on: https://webrtc-review.googlesource.com/97360
Commit-Queue: Jonas Olsson <7906496040a7ac5328c0e08cb0fb50d1a12c27fd@webrtc.org>
Reviewed-by: Steve Anton <93f73658da16553b94c040887a439a155812e54e@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#24564}
TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc