Clear PacketBuffer when full.

webrtc/modules/video_coding/packet_buffer.cc

Index: webrtc/modules/video_coding/packet_buffer.cc
diff --git a/webrtc/modules/video_coding/packet_buffer.cc b/webrtc/modules/video_coding/packet_buffer.cc
index f30a3ea722e5ccf0721bf0743635abcd281226cc..3b0d09f042efc77ec7cb77a92b33877d0493237a 100644
--- a/webrtc/modules/video_coding/packet_buffer.cc
+++ b/webrtc/modules/video_coding/packet_buffer.cc
@@ -148,7 +148,8 @@ void PacketBuffer::Clear() {
 bool PacketBuffer::ExpandBufferSize() {
   if (size_ == max_size_) {
     LOG(LS_WARNING) << "PacketBuffer is already at max size (" << max_size_
-                    << "), failed to increase size.";
+                    << "), failed to increase size. Clearing PacketBuffer.";
+    Clear();
     return false;
   }