Revert "Added synchronous socket implementation to dart:io."

runtime/bin/sync_socket.h

Index: runtime/bin/sync_socket.h
diff --git a/runtime/bin/sync_socket.h b/runtime/bin/sync_socket.h
deleted file mode 100644
index 4a918365aa79548c4d769668485a86064e3f6627..0000000000000000000000000000000000000000
--- a/runtime/bin/sync_socket.h
+++ /dev/null
@@ -1,48 +0,0 @@
-// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#ifndef RUNTIME_BIN_SYNC_SOCKET_H_
-#define RUNTIME_BIN_SYNC_SOCKET_H_
-
-#if defined(DART_IO_DISABLED)
-#error "sync_socket.h can only be included on builds with IO enabled"
-#endif
-
-#include "bin/socket_base.h"
-#include "platform/globals.h"
-
-namespace dart {
-namespace bin {
-
-class SynchronousSocket {
- public:
-  explicit SynchronousSocket(intptr_t fd);
-  ~SynchronousSocket() { ASSERT(fd_ == kClosedFd); }
-
-  intptr_t fd() const { return fd_; }
-  void SetClosedFd();
-
-  static bool Initialize();
-
-  static intptr_t CreateConnect(const RawAddr& addr);
-
-  static Dart_Handle SetSocketIdNativeField(Dart_Handle handle, intptr_t id);
-  static Dart_Handle GetSocketIdNativeField(Dart_Handle socket_obj,
-                                            SynchronousSocket** socket);
-
-  static void ShutdownRead(intptr_t fd);
-  static void ShutdownWrite(intptr_t fd);
-
- private:
-  static const int kClosedFd = -1;
-
-  intptr_t fd_;
-
-  DISALLOW_COPY_AND_ASSIGN(SynchronousSocket);
-};
-
-}  // namespace bin
-}  // namespace dart
-
-#endif  // RUNTIME_BIN_SYNC_SOCKET_H_