Fix bug 574524: DtlsTransportChannel crashes after SSL closes remotely

webrtc/base/bufferqueue.h

Index: webrtc/base/bufferqueue.h
diff --git a/webrtc/base/bufferqueue.h b/webrtc/base/bufferqueue.h
index 458f0189cdbe541301cbd9e5bacacdd953a67db7..cf231198e1684ed7c788c287289f89e340050604 100644
--- a/webrtc/base/bufferqueue.h
+++ b/webrtc/base/bufferqueue.h
@@ -28,6 +28,9 @@ class BufferQueue {
   // Return number of queued buffers.
   size_t size() const;
 
+  // Clear the BufferQueue by moving all Buffers from |queue_| to |free_list_|.
+  void Clear();
+
   // ReadFront will only read one buffer at a time and will truncate buffers
   // that don't fit in the passed memory.
   // Returns true unless no data could be returned.