Move QuicIoVector into its own header file. No behavior change.

net/quic/core/quic_iovector.h

+// Copyright (c) 2012 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.
+
+#ifndef NET_QUIC_QUIC_IOVECTOR_H_
+#define NET_QUIC_QUIC_IOVECTOR_H_
+
+#include <stddef.h>
+
+#include "net/base/iovec.h"
+#include "net/base/net_export.h"
+
+namespace net {
+
+// Convenience wrapper to wrap an iovec array and the total length, which must
+// be less than or equal to the actual total length of the iovecs.
+struct NET_EXPORT_PRIVATE QuicIOVector {
+  QuicIOVector(const struct iovec* iov, int iov_count, size_t total_length)
+      : iov(iov), iov_count(iov_count), total_length(total_length) {}
+
+  const struct iovec* iov;
+  const int iov_count;
+  const size_t total_length;
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_QUIC_IOVECTOR_H_