http: Use stream.push() instead of touching _readableState

lib/http.js

@@ -122,17 +122,15 @@ function parserOnBody(b, start, len) {
   if (!stream)
     return;
 
-  var rs = stream._readableState;
   var socket = stream.socket;
 
   // pretend this was the result of a stream._read call.
-  if (len > 0) {
+  if (len > 0 && !stream._dumped) {
     var slice = b.slice(start, start + len);
-    rs.onread(null, slice);
-  }
-
-  if (rs.length >= rs.highWaterMark)
+    var ret = stream.push(slice);
+    if (!ret)
       socket.pause();
+  }
 }
 
 function parserOnMessageComplete() {
@@ -155,14 +153,12 @@ function parserOnMessageComplete() {
 
     if (!stream.upgrade)
       // For upgraded connections, also emit this after parser.execute
-      stream._readableState.onread(null, null);
+      stream.push(null);
   }
 
-  if (stream &&
-      !stream._readableState.endEmitted &&
-      !parser.incoming._pendings.length) {
+  if (stream && !parser.incoming._pendings.length) {
     // For emit end event
-    stream._readableState.onread(null, null);
+    stream.push(null);
   }
 
   if (parser.socket.readable) {
@@ -402,7 +398,7 @@ IncomingMessage.prototype._addHeaderLine = function(field, value) {
 IncomingMessage.prototype._dump = function() {
   this._dumped = true;
   this.socket.parser.incoming = null;
-  this._readableState.onread(null, null);
+  this.push(null);
   this.socket.resume();
 };
 
@@ -1363,7 +1359,7 @@ function socketCloseListener() {
     res.on('end', function() {
       res.emit('close');
     });
-    res._readableState.onread(null, null);
+    res.push(null);
   } else if (!req.res && !req._hadError) {
     // This socket error fired before we started to
     // receive a response. The error needs to