Revert r143458 (which re-applies r143341 and r142979).

content/browser/renderer_host/resource_dispatcher_host_impl.h

 // Copyright (c) 2012 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.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the child process (i.e. [Renderer, Plugin, Worker]ProcessHost), and
 // dispatches them to URLRequests. It then forwards the messages from the
 // URLRequests back to the correct process for handling.
 //
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
@@ skipping 104 matching lines @@
                      int child_id,
                      int route_id,
                      ResourceContext* context);
 
   // Cancels the given request if it still exists. We ignore cancels from the
   // renderer in the event of a download.
   void CancelRequest(int child_id,
                      int request_id,
                      bool from_renderer);
 
-  // Returns true if it's ok to send the data. If there are already too many
-  // data messages pending, it pauses the request and returns false. In this
-  // case the caller should not send the data.
-  bool WillSendData(int child_id, int request_id, bool* defer);
-
   // Marks the request as "parked". This happens if a request is
   // redirected cross-site and needs to be resumed by a new render view.
   void MarkAsTransferredNavigation(const GlobalRequestID& id);
 
   // Returns the number of pending requests. This is designed for the unittests
   int pending_requests() const {
     return static_cast<int>(pending_loaders_.size());
   }
 
   // Intended for unit-tests only. Returns the memory cost of all the
@@ skipping 46 matching lines @@
   // started) until ResumeBlockedRequestsForRoute or
   // CancelBlockedRequestsForRoute is called.
   void BlockRequestsForRoute(int child_id, int route_id);
 
   // Resumes any blocked request for the specified route id.
   void ResumeBlockedRequestsForRoute(int child_id, int route_id);
 
   // Cancels any blocked request for the specified route id.
   void CancelBlockedRequestsForRoute(int child_id, int route_id);
 
-  // Decrements the pending_data_count for the request and resumes
-  // the request if it was paused due to too many pending data
-  // messages sent.
-  void DataReceivedACK(int child_id, int request_id);
-
   // Maintains a collection of temp files created in support of
   // the download_to_file capability. Used to grant access to the
   // child process and to defer deletion of the file until it's
   // no longer needed.
   void RegisterDownloadedTempFile(
       int child_id, int request_id,
       webkit_blob::ShareableFileReference* reference);
   void UnregisterDownloadedTempFile(int child_id, int request_id);
 
   // Needed for the sync IPC message dispatcher macros.
@@ skipping 217 matching lines @@
   // http://crbug.com/90971 - Assists in tracking down use-after-frees on
   // shutdown.
   std::set<const ResourceContext*> active_resource_contexts_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RESOURCE_DISPATCHER_HOST_IMPL_H_