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

chrome/common/resource_dispatcher.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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "chrome/common/resource_dispatcher.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/message_loop.h"
 #include "base/shared_memory.h"
 #include "base/string_util.h"
 #include "chrome/common/extensions/extension_localization_peer.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/security_filter_peer.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
-#include "net/http/http_response_headers.h"
 #include "webkit/glue/resource_type.h"
 #include "webkit/glue/webkit_glue.h"
 
 // Uncomment to enable logging of request traffic
 // #define LOG_RESOURCE_REQUESTS
 
 #ifdef LOG_RESOURCE_REQUESTS
 # define RESOURCE_LOG(stuff) LOG(INFO) << stuff
 #else
 # define RESOURCE_LOG(stuff)
@@ skipping 590 matching lines @@
 
 // static
 void ResourceDispatcher::ReleaseResourcesInMessageQueue(MessageQueue* queue) {
   while (!queue->empty()) {
     IPC::Message* message = queue->front();
     ReleaseResourcesInDataMessage(*message);
     queue->pop_front();
     delete message;
   }
 }