Zhi Huang a8264dbdd9 Reject the subsequent offer with fewer m= sections.
If the subsequent offer contains fewer m= sections than the existing
description, it would be rejected.

The helper method MediaSectionsInSameOrder is modified and it will
compare the number of m= sections before matching the media type.

Bug: chromium:773620
Change-Id: Ic8999445f4bc023da1d85a65659583db1687ec37
Reviewed-on: https://webrtc-review.googlesource.com/9621
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Commit-Queue: Zhi Huang <zhihuang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20298}
2017-10-14 00:40:32 +00:00
..