Completely revert all my IPC work to see if this was what regressed the page cycler.

chrome/browser/renderer_host/sync_resource_handler.cc

 // Copyright (c) 2010 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 "chrome/browser/renderer_host/sync_resource_handler.h"
-
 #include "base/logging.h"
 #include "chrome/common/render_messages.h"
 #include "net/base/io_buffer.h"
 #include "net/http/http_response_headers.h"
 
 SyncResourceHandler::SyncResourceHandler(
     ResourceDispatcherHost::Receiver* receiver,
     const GURL& url,
     IPC::Message* result_message)
     : read_buffer_(new net::IOBuffer(kReadBufSize)),
@@ skipping 71 matching lines @@
 }
 
 void SyncResourceHandler::OnRequestClosed() {
   if (!result_message_)
     return;
 
   result_message_->set_reply_error();
   receiver_->Send(result_message_);
   receiver_ = NULL;  // URLRequest is gone, and perhaps also the receiver.
 }