Move QuicAckListenerInterface, QuicPendingRetransmission, and QuicTransmissionInfo out of quic_pack…

net/quic/core/quic_ack_listener_interface.cc

Index: net/quic/core/quic_ack_listener_interface.cc
diff --git a/net/quic/core/quic_ack_listener_interface.cc b/net/quic/core/quic_ack_listener_interface.cc
new file mode 100644
index 0000000000000000000000000000000000000000..35ec61038f681bd32825aad9450ca1233004b9b6
--- /dev/null
+++ b/net/quic/core/quic_ack_listener_interface.cc
@@ -0,0 +1,20 @@
+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/quic/core/quic_ack_listener_interface.h"
+
+namespace net {
+
+AckListenerWrapper::AckListenerWrapper(QuicAckListenerInterface* listener,
+                                       QuicPacketLength data_length)
+    : ack_listener(listener), length(data_length) {
+  DCHECK(listener != nullptr);
+}
+
+AckListenerWrapper::AckListenerWrapper(const AckListenerWrapper& other) =
+    default;
+
+AckListenerWrapper::~AckListenerWrapper() {}
+
+}  // namespace net