Re-land socket refactor with fixes for Windows.

runtime/bin/socket_base_unsupported.cc

Index: runtime/bin/socket_base_unsupported.cc
diff --git a/runtime/bin/socket_base_unsupported.cc b/runtime/bin/socket_base_unsupported.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e8c51f94abac8f6259194f24dc09ce0241a4e05a
--- /dev/null
+++ b/runtime/bin/socket_base_unsupported.cc
@@ -0,0 +1,38 @@
+// 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.
+
+#if defined(DART_IO_DISABLED)
+
+#include "bin/builtin.h"
+#include "bin/dartutils.h"
+#include "include/dart_api.h"
+
+namespace dart {
+namespace bin {
+
+bool short_socket_read = false;
+
+bool short_socket_write = false;
+
+void FUNCTION_NAME(InternetAddress_Parse)(Dart_NativeArguments args) {
+  Dart_ThrowException(
+      DartUtils::NewDartArgumentError("Sockets unsupported on this platform"));
+}
+
+
+void FUNCTION_NAME(NetworkInterface_ListSupported)(Dart_NativeArguments args) {
+  Dart_ThrowException(
+      DartUtils::NewDartArgumentError("Sockets unsupported on this platform"));
+}
+
+
+void FUNCTION_NAME(SocketBase_IsBindError)(Dart_NativeArguments args) {
+  Dart_ThrowException(
+      DartUtils::NewDartArgumentError("Sockets unsupported on this platform"));
+}
+
+}  // namespace bin
+}  // namespace dart
+
+#endif  // defined(DART_IO_DISABLED)