Don't use IsolateData for the exit hook as multiple embedders share the dart/bin while using differ…

runtime/bin/process_win.cc

 // Copyright (c) 2012, 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_WINDOWS)
 
 #include "bin/process.h"
@@ skipping 11 matching lines @@
 #include "bin/utils_win.h"
 
 namespace dart {
 namespace bin {
 
 static const int kReadHandle = 0;
 static const int kWriteHandle = 1;
 
 int Process::global_exit_code_ = 0;
 Mutex* Process::global_exit_code_mutex_ = new Mutex();
+Process::ExitHook Process::exit_hook_ = NULL;
 
 // ProcessInfo is used to map a process id to the process handle,
 // wait handle for registered exit code event and the pipe used to
 // communicate the exit code of the process to Dart.
 // ProcessInfo objects are kept in the static singly-linked
 // ProcessInfoList.
 class ProcessInfo {
  public:
   ProcessInfo(DWORD process_id,
               HANDLE process_handle,
@@ skipping 1039 matching lines @@
   }
   delete handler;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)
 
 #endif  // !defined(DART_IO_DISABLED)