Fix two issues in the websocket.

runtime/bin/socket_stream_impl.dart

 // 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.
 
 class _SocketInputStream implements SocketInputStream {
   _SocketInputStream(Socket socket) : _socket = socket {
     if (_socket._id == -1) _closed = true;
     _socket.onClosed = _onClosed;
   }
 
@@ skipping 161 matching lines @@
     _socket._onWrite = _onWrite;
     return false;
   }
 
   void _onWrite() {
     // Write as much buffered data to the socket as possible.
     while (!_pendingWrites.isEmpty()) {
       List<int> buffer = _pendingWrites.first;
       int offset = _pendingWrites.index;
       int bytesToWrite = buffer.length - offset;
-      int bytesWritten = _socket.writeList(buffer, offset, bytesToWrite);
+      int bytesWritten;
+      try {
+        bytesWritten = _socket.writeList(buffer, offset, bytesToWrite);
+      } catch (e) {
+        _pendingWrites.clear();
+        _onSocketError(e);
+        return;
+      }
       _pendingWrites.removeBytes(bytesWritten);
       if (bytesWritten < bytesToWrite) {
         _socket._onWrite = _onWrite;
         return;
       }
     }
 
     // All buffered data was written.
     if (_closing) {
       _socket._closeWrite();
@@ skipping 21 matching lines @@
     }
   }
 
   Socket _socket;
   _BufferList _pendingWrites;
   Function _onNoPendingWrites;
   Function _onClosed;
   bool _closing = false;
   bool _closed = false;
 }