[SPDY] Replace SpdyIOBuffer with new SpdyBuffer class

net/spdy/spdy_io_buffer.cc

-// 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.
-
-#include "net/spdy/spdy_io_buffer.h"
-#include "net/spdy/spdy_stream.h"
-
-namespace net {
-
-SpdyIOBuffer::SpdyIOBuffer() {}
-
-SpdyIOBuffer::SpdyIOBuffer(IOBuffer* buffer, int size, SpdyStream* stream)
-  : buffer_(new DrainableIOBuffer(buffer, size)), stream_(stream) {}
-
-SpdyIOBuffer::SpdyIOBuffer(const SpdyIOBuffer& rhs) {
-  buffer_ = rhs.buffer_;
-  stream_ = rhs.stream_;
-}
-
-SpdyIOBuffer::~SpdyIOBuffer() {}
-
-SpdyIOBuffer& SpdyIOBuffer::operator=(const SpdyIOBuffer& rhs) {
-  buffer_ = rhs.buffer_;
-  stream_ = rhs.stream_;
-  return *this;
-}
-
-void SpdyIOBuffer::Swap(SpdyIOBuffer* other) {
-  buffer_.swap(other->buffer_);
-  stream_.swap(other->stream_);
-}
-
-void SpdyIOBuffer::Release() {
-  buffer_ = NULL;
-  stream_ = NULL;
-}
-
-}  // namespace net