Remove unused member

runtime/bin/http_impl.dart

Index: runtime/bin/http_impl.dart
diff --git a/runtime/bin/http_impl.dart b/runtime/bin/http_impl.dart
index c00b06aa1e875a107e748709536dbfbfe480dd97..b92b4b81517aacb527c0be555827263a6aa27b46 100644
--- a/runtime/bin/http_impl.dart
+++ b/runtime/bin/http_impl.dart
@@ -1251,8 +1251,7 @@ class _HttpOutputStream extends _BaseOutputStream implements OutputStream {
 
 
 class _HttpConnectionBase {
-  _HttpConnectionBase() : _sendBuffers = new Queue(),
-                          _httpParser = new _HttpParser(),
+  _HttpConnectionBase() : _httpParser = new _HttpParser(),
                           hashCode = _nextHashCode {
     _nextHashCode = (_nextHashCode + 1) & 0xFFFFFFF;
   }
@@ -1362,8 +1361,6 @@ class _HttpConnectionBase {
   bool _error = false;  // Is the socket closed due to an error?
   _HttpParser _httpParser;
 
-  Queue _sendBuffers;
-
   Function onDetach;
 
   // Hash code for HTTP connection. Currently this is just a counter.