Fix bug 574524: DtlsTransportChannel crashes after SSL closes remotely

webrtc/base/bufferqueue.cc

Index: webrtc/base/bufferqueue.cc
diff --git a/webrtc/base/bufferqueue.cc b/webrtc/base/bufferqueue.cc
index 1ac57abc0cad425d132a0e1b5f69a438f13eab88..ce83e53f691a31f2822784f02b5e2e9ce5479c03 100644
--- a/webrtc/base/bufferqueue.cc
+++ b/webrtc/base/bufferqueue.cc
@@ -32,6 +32,14 @@ size_t BufferQueue::size() const {
   return queue_.size();
 }
 
+void BufferQueue::Clear() {
+  CritScope cs(&crit_);
+  while (!queue_.empty()) {
+    free_list_.push_back(queue_.front());
+    queue_.pop_front();
+  }
+}
+
 bool BufferQueue::ReadFront(void* buffer, size_t bytes, size_t* bytes_read) {
   CritScope cs(&crit_);
   if (queue_.empty()) {