After r12485, every POST request has an UploadData,...

net/http/http_network_transaction.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_network_transaction.h"
 
 #include "base/scoped_ptr.h"
 #include "base/compiler_specific.h"
 #include "base/field_trial.h"
 #include "base/string_util.h"
@@ skipping 652 matching lines @@
   return connection_.socket()->Write(buf, buf_len, &io_callback_);
 }
 
 int HttpNetworkTransaction::DoWriteHeadersComplete(int result) {
   if (result < 0)
     return HandleIOError(result);
 
   request_headers_bytes_sent_ += result;
   if (request_headers_bytes_sent_ < request_headers_.size()) {
     next_state_ = STATE_WRITE_HEADERS;
-  } else if (!establishing_tunnel_ && request_->upload_data) {
+  } else if (!establishing_tunnel_ && request_body_stream_.get() &&
+             request_body_stream_->size()) {
     next_state_ = STATE_WRITE_BODY;
   } else {
     next_state_ = STATE_READ_HEADERS;
   }
   return OK;
 }
 
 int HttpNetworkTransaction::DoWriteBody() {
   next_state_ = STATE_WRITE_BODY_COMPLETE;
 
-  DCHECK(request_->upload_data);
   DCHECK(request_body_stream_.get());
+  DCHECK(request_body_stream_->size());
 
   const char* buf = request_body_stream_->buf();
   int buf_len = static_cast<int>(request_body_stream_->buf_len());
 
   return connection_.socket()->Write(buf, buf_len, &io_callback_);
 }
 
 int HttpNetworkTransaction::DoWriteBodyComplete(int result) {
   if (result < 0)
     return HandleIOError(result);
@@ skipping 816 matching lines @@
   if (target == HttpAuth::AUTH_PROXY) {
     auth_info->host = ASCIIToWide(proxy_info_.proxy_server().host_and_port());
   } else {
     DCHECK(target == HttpAuth::AUTH_SERVER);
     auth_info->host = ASCIIToWide(request_->url.host());
   }
   response_.auth_challenge = auth_info;
 }
 
 }  // namespace net