[dart:io] Don't close stdin with a socket finalizer

runtime/bin/eventhandler_win.h

 // 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.
 
 #ifndef RUNTIME_BIN_EVENTHANDLER_WIN_H_
 #define RUNTIME_BIN_EVENTHANDLER_WIN_H_
 
 #if !defined(RUNTIME_BIN_EVENTHANDLER_H_)
 #error Do not include eventhandler_win.h directly; use eventhandler.h instead.
 #endif
@@ skipping 292 matching lines @@
   virtual void EnsureInitialized(EventHandlerImplementation* event_handler);
   virtual bool IsClosed();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FileHandle);
 };
 
 
 class StdHandle : public FileHandle {
  public:
+  static StdHandle* Stdin(HANDLE handle);
+
+  virtual void DoClose();
+  virtual intptr_t Write(const void* buffer, intptr_t num_bytes);
+
+  void WriteSyncCompleteAsync();
+  void RunWriteLoop();
+
+#if defined(DEBUG)
+  static StdHandle* StdinPtr() { return stdin_; }
+#endif
+
+ private:
+  static Mutex* stdin_mutex_;
+  static StdHandle* stdin_;
+
   explicit StdHandle(HANDLE handle)
       : FileHandle(handle),
         thread_id_(Thread::kInvalidThreadId),
         thread_handle_(NULL),
         thread_wrote_(0),
         write_thread_exists_(false),
         write_thread_running_(false) {
     type_ = kStd;
   }
 
-  virtual void DoClose();
-  virtual intptr_t Write(const void* buffer, intptr_t num_bytes);
-
-  void WriteSyncCompleteAsync();
-  void RunWriteLoop();
-
- private:
   ThreadId thread_id_;
   HANDLE thread_handle_;
   intptr_t thread_wrote_;
   bool write_thread_exists_;
   bool write_thread_running_;
 
   DISALLOW_COPY_AND_ASSIGN(StdHandle);
 };
 
 
@@ skipping 226 matching lines @@
   bool shutdown_;
   HANDLE completion_port_;
 
   DISALLOW_COPY_AND_ASSIGN(EventHandlerImplementation);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // RUNTIME_BIN_EVENTHANDLER_WIN_H_