[fuchsia] fix uninitialized field in the event handler

runtime/bin/eventhandler_fuchsia.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 "platform/globals.h"
 #if defined(TARGET_OS_FUCHSIA)
 
 #include "bin/eventhandler.h"
 #include "bin/eventhandler_fuchsia.h"
 
 #include <magenta/syscalls.h>
 #include <runtime/status.h>
 
 #include "bin/thread.h"
 #include "bin/utils.h"
 
 namespace dart {
 namespace bin {
 
 EventHandlerImplementation::EventHandlerImplementation() {
   mx_status_t status = mx_msgpipe_create(interrupt_handles_, 0);
   if (status != NO_ERROR) {
     FATAL1("mx_msgpipe_create failed: %s\n", mx_strstatus(status));
   }
+  shutdown_ = false;
 }
 
 
 EventHandlerImplementation::~EventHandlerImplementation() {
   mx_status_t status = mx_handle_close(interrupt_handles_[0]);
   if (status != NO_ERROR) {
     FATAL1("mx_handle_close failed: %s\n", mx_strstatus(status));
   }
   status = mx_handle_close(interrupt_handles_[1]);
   if (status != NO_ERROR) {
@@ skipping 126 matching lines @@
                                           int64_t data) {
   WakeupHandler(id, dart_port, data);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_FUCHSIA)
 
 #endif  // !defined(DART_IO_DISABLED)