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

net/http/http_network_transaction.cc

Index: net/http/http_network_transaction.cc
===================================================================
--- net/http/http_network_transaction.cc	(revision 12593)
+++ net/http/http_network_transaction.cc	(working copy)
@@ -670,7 +670,8 @@
   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;
@@ -681,8 +682,8 @@
 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());