Revert of [NaCl SDK] nacl_io: Add support for basic socketpairs.

native_client_sdk/src/libraries/nacl_io/socket/unix_event_emitter.h

Index: native_client_sdk/src/libraries/nacl_io/socket/unix_event_emitter.h
diff --git a/native_client_sdk/src/libraries/nacl_io/socket/unix_event_emitter.h b/native_client_sdk/src/libraries/nacl_io/socket/unix_event_emitter.h
deleted file mode 100644
index f8c952dd0e3ab905bb596a4d197825c16b9c34e5..0000000000000000000000000000000000000000
--- a/native_client_sdk/src/libraries/nacl_io/socket/unix_event_emitter.h
+++ /dev/null
@@ -1,50 +0,0 @@
-// Copyright 2015 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 LIBRARIES_NACL_IO_SOCKET_UNIX_EVENT_EMITTER_H_
-#define LIBRARIES_NACL_IO_SOCKET_UNIX_EVENT_EMITTER_H_
-
-#include "nacl_io/fifo_char.h"
-#include "nacl_io/stream/stream_event_emitter.h"
-
-#include "sdk_util/macros.h"
-#include "sdk_util/scoped_ref.h"
-#include "sdk_util/simple_lock.h"
-
-namespace nacl_io {
-
-class UnixEventEmitter;
-class Node;
-
-typedef sdk_util::ScopedRef<UnixEventEmitter> ScopedUnixEventEmitter;
-
-class UnixEventEmitter : public StreamEventEmitter {
- public:
-  uint32_t ReadIn_Locked(char* buffer, uint32_t len);
-  uint32_t WriteOut_Locked(const char* buffer, uint32_t len);
-
-  uint32_t BytesInOutputFIFO();
-  uint32_t SpaceInInputFIFO();
-
-  virtual ScopedUnixEventEmitter GetPeerEmitter() = 0;
-
-  static ScopedUnixEventEmitter MakeUnixEventEmitter(size_t size);
-
- protected:
-  UnixEventEmitter() {}
-
-  // Probably only need the master's lock.
-  virtual const sdk_util::SimpleLock& GetFifoLock() = 0;
-  virtual FIFOInterface* in_fifo() { return in_fifoc(); }
-  virtual FIFOInterface* out_fifo() { return out_fifoc(); }
-  virtual FIFOChar* in_fifoc() = 0;
-  virtual FIFOChar* out_fifoc() = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(UnixEventEmitter);
-};
-
-}  // namespace nacl_io
-
-#endif  // LIBRARIES_NACL_IO_SOCKET_UNIX_EVENT_EMITTER_H_