Remove obsolete comment (WebRtcSessionDescriptionFactory ctor)
Remove obsolete comment (WebRtcSessionDescriptionFactory ctor)

Bug: None
Change-Id: Ib1c5f3e0c40df93826f90183f182302cce197132
Reviewed-on: https://webrtc-review.googlesource.com/c/110611
Reviewed-by: Per Kjellander <ec3efbb37602a1ca89f5fcf018e3a9e25086611a@webrtc.org>
Commit-Queue: Elad Alon <9d66cb9c3c57b29e6fc055a4405dac15e20e28ee@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#25605}
ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc