Remove now unused Balsa code.

net/tools/balsa/buffer_interface.h

-// Copyright 2013 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_TOOLS_BALSA_BUFFER_INTERFACE_H__
-#define NET_TOOLS_BALSA_BUFFER_INTERFACE_H__
-
-namespace net {
-
-class BufferInterface {
- public:
-
-  //   Returns the bytes which can be read from the buffer.  There is no
-  //   guarantee that the bytes are contiguous.
-  virtual int ReadableBytes() const = 0;
-
-  // Summary:
-  //   returns the size of this buffer
-  // Returns:
-  //   size of this buffer.
-  virtual int BufferSize() const = 0;
-
-  // Summary:
-  //   returns the number of bytes free in this buffer.
-  // Returns:
-  //   number of bytes free.
-  virtual int BytesFree() const = 0;
-
-  // Summary:
-  //   Returns true if empty.
-  // Returns:
-  //   true - if empty
-  //   false - otherwise
-  virtual bool Empty() const = 0;
-
-  // Summary:
-  //   Returns true if the buffer is full.
-  virtual bool Full() const = 0;
-
-  // Summary:
-  //   returns the number of characters written.
-  //   appends up-to-'size' bytes to the buffer.
-  // Args:
-  //   bytes - bytes which are read, and copied into the buffer.
-  //   size  - number of bytes which are read and copied.
-  //           this number shall be >= 0.
-  virtual int Write(const char* bytes, int size) = 0;
-
-  // Summary:
-  //   Gets a pointer which can be written to (assigned to).
-  //   this pointer (and size) can be used in functions like
-  //   recv() or read(), etc.
-  //   If *size is zero upon returning from this function, that it
-  //   is unsafe to dereference *ptr.
-  // Args:
-  //   ptr - assigned a pointer to which we can write
-  //   size - the amount of data (in bytes) that it is safe to write to ptr.
-  virtual void GetWritablePtr(char **ptr, int* size) const = 0;
-
-  // Summary:
-  //   Gets a pointer which can be read from
-  //   this pointer (and size) can be used in functions like
-  //   send() or write(), etc.
-  //   If *size is zero upon returning from this function, that it
-  //   is unsafe to dereference *ptr.
-  // Args:
-  //   ptr - assigned a pointer from which we may read
-  //   size - the amount of data (in bytes) that it is safe to read
-  virtual void GetReadablePtr(char **ptr, int* size) const = 0;
-
-  // Summary:
-  //   Reads bytes out of the buffer, and writes them into 'bytes'.
-  //   Returns the number of bytes read.
-  //   Consumes bytes from the buffer (possibly, but not necessarily
-  //   rendering them free)
-  // Args:
-  //   bytes - the pointer into which bytes are read from this buffer
-  //           and written into
-  //   size  - number of bytes which are read and copied.
-  //           this number shall be >= 0.
-  // Returns:
-  //   the number of bytes read from 'bytes'
-  virtual int Read(char* bytes, int size) = 0;
-
-  // Summary:
-  //   removes all data from the buffer
-  virtual void Clear() = 0;
-
-  // Summary:
-  //   reserves contiguous writable empty space in the buffer of size bytes.
-  //   Returns true if the reservation is successful.
-  //   If a derive class chooses not to implement reservation, its
-  //   implementation should return false.
-  virtual bool Reserve(int size) = 0;
-
-  // Summary:
-  //   removes the oldest 'amount_to_consume' characters from this buffer,
-  // Args:
-  //   amount_to_advance - .. this should be self-explanatory =)
-  //                       this number shall be >= 0.
-  virtual void AdvanceReadablePtr(int amount_to_advance) = 0;
-
-  // Summary:
-  //   Moves the internal pointers around such that the
-  //   amount of data specified here is expected to
-  //   already be resident (as if it was Written)
-  // Args:
-  //   amount_to_advance - self explanatory.
-  //                       this number shall be >= 0.
-  virtual void AdvanceWritablePtr(int amount_to_advance) = 0;
-
-  virtual ~BufferInterface() {}
-
- protected:
-  BufferInterface() {}
-};
-
-}  // namespace net
-
-#endif  // NET_TOOLS_BALSA_BUFFER_INTERFACE__H__
-