Increase RtpFrameReferenceFinder's frame buffer length to 100 frames.
Increase RtpFrameReferenceFinder's frame buffer length to 100 frames.

This mitigates the long freeze issue caused by overflow of frame
buffer in RtpFrameReferenceFinder and subsequent removal of old, but
not yet decoded frames, from the buffer.

Bug: webrtc:9550
Change-Id: I03390bb58847688c6cb3f4868bf21269ad07073a
Reviewed-on: https://webrtc-review.googlesource.com/91124
Commit-Queue: Sergey Silkin <fc631354f276613a5410ea259cf4618b2846d39b@webrtc.org>
Reviewed-by: Philip Eliasson <729b5e2dca9359bca8c81d600ef9d3e554586ac9@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#24152}
TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc