pkg/http_server: move to multi-lib layout

pkg/http_server/lib/src/http_body_impl.dart

 // Copyright (c) 2013, 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.
 
-part of http_server;
+library http_server.http_body_impl;
 
-class _HttpBodyHandlerTransformer
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:mime/mime.dart';
+
+import 'http_body.dart';
+import 'http_multipart_form_data.dart';
+
+class HttpBodyHandlerTransformer
     implements StreamTransformer<HttpRequest, HttpRequestBody> {
   final Encoding _defaultEncoding;
 
-  const _HttpBodyHandlerTransformer(this._defaultEncoding);
+  const HttpBodyHandlerTransformer(this._defaultEncoding);
 
   Stream<HttpRequestBody> bind(Stream<HttpRequest> stream) {
     return new Stream<HttpRequestBody>.eventTransformed(
         stream,
         (EventSink<HttpRequestBody> sink) =>
             new _HttpBodyHandlerTransformerSink(_defaultEncoding, sink));
   }
 }
 
 class _HttpBodyHandlerTransformerSink implements EventSink<HttpRequest> {
   final Encoding _defaultEncoding;
   final EventSink<HttpRequestBody> _outSink;
   int _pending = 0;
   bool _closed = false;
 
   _HttpBodyHandlerTransformerSink(this._defaultEncoding, this._outSink);
 
   void add(HttpRequest request) {
     _pending++;
-    _HttpBodyHandler.processRequest(request, _defaultEncoding)
+    HttpBodyHandlerImpl.processRequest(request, _defaultEncoding)
         .then(_outSink.add, onError: _outSink.addError)
         .whenComplete(() {
           _pending--;
           if (_closed && _pending == 0) _outSink.close();
         });
   }
   void addError(Object error, [StackTrace stackTrace]) {
     _outSink.addError(error, stackTrace);
   }
   void close() {
     _closed = true;
     if (_pending == 0) _outSink.close();
   }
 }
 
-class _HttpBodyHandler {
+class HttpBodyHandlerImpl {
   static Future<HttpRequestBody> processRequest(
       HttpRequest request,
       Encoding defaultEncoding) {
     return process(request, request.headers, defaultEncoding)
         .then((body) => new _HttpRequestBody(request, body),
               onError: (error) {
                 // Try to send BAD_REQUEST response.
                 request.response.statusCode = HttpStatus.BAD_REQUEST;
                 request.response.close();
                 throw error;
@@ skipping 138 matching lines @@
       : super(body.type, body.body);
 }
 
 class _HttpClientResponseBody
     extends _HttpBody implements HttpClientResponseBody {
   final HttpClientResponse response;
 
   _HttpClientResponseBody(this.response, HttpBody body)
       : super(body.type, body.body);
 }