Removed duplicate variable definitions in socket_unsupport and socket_base_unsupported.

runtime/bin/socket_unsupported.cc

 // Copyright (c) 2016, 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(Socket_CreateConnect)(Dart_NativeArguments args) {
   Dart_ThrowException(
       DartUtils::NewDartArgumentError("Sockets unsupported on this platform"));
 }
 
 
 void FUNCTION_NAME(Socket_CreateBindConnect)(Dart_NativeArguments args) {
   Dart_ThrowException(
       DartUtils::NewDartArgumentError("Sockets unsupported on this platform"));
 }
@@ skipping 109 matching lines @@
 
 void FUNCTION_NAME(Socket_LeaveMulticast)(Dart_NativeArguments args) {
   Dart_ThrowException(
       DartUtils::NewDartArgumentError("Sockets unsupported on this platform"));
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(DART_IO_DISABLED)