Another attempt at landing this patch. ...

chrome/renderer/webplugin_delegate_proxy.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 "chrome/renderer/webplugin_delegate_proxy.h"
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <atlbase.h>
@@ skipping 82 matching lines @@
   void WillSendRequest(const GURL& url) {
     DCHECK(channel_ != NULL);
     channel_->Send(new PluginMsg_WillSendRequest(instance_id_, resource_id_,
                                                  url));
   }
 
   void DidReceiveResponse(const std::string& mime_type,
                           const std::string& headers,
                           uint32 expected_length,
                           uint32 last_modified,
-                          bool request_is_seekable,
-                          bool* cancel) {
+                          bool request_is_seekable) {
     DCHECK(channel_ != NULL);
     PluginMsg_DidReceiveResponseParams params;
     params.id = resource_id_;
     params.mime_type = mime_type;
     params.headers = headers;
     params.expected_length = expected_length;
     params.last_modified = last_modified;
     params.request_is_seekable = request_is_seekable;
     // Grab a reference on the underlying channel so it does not get
     // deleted from under us.
     scoped_refptr<PluginChannelHost> channel_ref(channel_);
-    channel_->Send(new PluginMsg_DidReceiveResponse(instance_id_, params,
-                                                    cancel));
+    channel_->Send(new PluginMsg_DidReceiveResponse(instance_id_, params));
   }
 
   void DidReceiveData(const char* buffer, int length, int data_offset) {
     DCHECK(channel_ != NULL);
     DCHECK(length > 0);
     std::vector<char> data;
     data.resize(static_cast<size_t>(length));
     memcpy(&data.front(), buffer, length);
     // Grab a reference on the underlying channel so it does not get
     // deleted from under us.
@@ skipping 837 matching lines @@
   plugin_->CancelDocumentLoad();
 }
 
 void WebPluginDelegateProxy::OnInitiateHTTPRangeRequest(
     const std::string& url, const std::string& range_info,
     intptr_t existing_stream, bool notify_needed, intptr_t notify_data) {
   plugin_->InitiateHTTPRangeRequest(url.c_str(), range_info.c_str(),
                                     existing_stream, notify_needed,
                                     notify_data);
 }