Make it clear what last_sync_timestamp actually tracks. Update

chrome/common/resource_dispatcher.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.
 
 // 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"
@@ skipping 297 matching lines @@
         "finished request";
     return;
   }
 
   PendingRequestInfo& request_info = it->second;
 
   RESOURCE_LOG("Dispatching upload progress for " <<
       request_info.peer->GetURLForDebugging().possibly_invalid_spec());
   request_info.peer->OnUploadProgress(position, size);
 
-  // Acknowlegde reciept
+  // Acknowledge receipt
   message_sender()->Send(
       new ViewHostMsg_UploadProgress_ACK(message.routing_id(), request_id));
 }
 
 void ResourceDispatcher::OnReceivedResponse(
     int request_id, const ResourceResponseHead& response_head) {
   PendingRequestList::iterator it = pending_requests_.find(request_id);
   if (it == pending_requests_.end()) {
     // This might happen for kill()ed requests on the webkit end, so perhaps it
     // shouldn't be a warning...
@@ skipping 277 matching lines @@
   // handle or there will be a memory leak.
   if (message.type() == ViewMsg_Resource_DataReceived::ID) {
     base::SharedMemoryHandle shm_handle;
     if (IPC::ParamTraits<base::SharedMemoryHandle>::Read(&message,
                                                          &iter,
                                                          &shm_handle)) {
       base::SharedMemory::CloseHandle(shm_handle);
     }
   }
 }