Convert SerialIoHandler to use buffer interfaces for I/O API methods.

device/serial/buffer.cc

Index: device/serial/buffer.cc
diff --git a/device/serial/buffer.cc b/device/serial/buffer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2756d9fc59eb222fea7b3f779ce8226df8b4537a
--- /dev/null
+++ b/device/serial/buffer.cc
@@ -0,0 +1,15 @@
+// Copyright 2014 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 "device/serial/buffer.h"
+
+namespace device {
+
+ReadOnlyBuffer::~ReadOnlyBuffer() {
+}
+
+WritableBuffer::~WritableBuffer() {
+}
+
+}  // namespace device