Break out balsa and epoll_server from net/tools/flip_server.

net/tools/balsa/buffer_interface.h

 // Copyright (c) 2009 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_FLIP_SERVER_BUFFER_INTERFACE_H__
-#define NET_TOOLS_FLIP_SERVER_BUFFER_INTERFACE_H__
+#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;
 
@@ skipping 93 matching lines @@
   virtual void AdvanceWritablePtr(int amount_to_advance) = 0;
 
   virtual ~BufferInterface() {}
 
  protected:
   BufferInterface() {}
 };
 
 }  // namespace net
 
-#endif  // NET_TOOLS_FLIP_SERVER_BUFFER_INTERFACE__H__
+#endif  // NET_TOOLS_BALSA_BUFFER_INTERFACE__H__