Change DownloadProcessHandle to be more of an encapsulated class.

chrome/browser/download/download_file_manager.cc

Index: chrome/browser/download/download_file_manager.cc
diff --git a/chrome/browser/download/download_file_manager.cc b/chrome/browser/download/download_file_manager.cc
index 0c200e5b004abb6e9733ff385d53c6a7f1223909..a13cfd993846b5ad86e1768211eabaf9f4534684 100644
--- a/chrome/browser/download/download_file_manager.cc
+++ b/chrome/browser/download/download_file_manager.cc
@@ -68,8 +68,7 @@ void DownloadFileManager::CreateDownloadFile(DownloadCreateInfo* info,
   scoped_ptr<DownloadFile>
       download_file(new DownloadFile(info, download_manager));
   if (!download_file->Initialize(get_hash)) {
-    download_util::CancelDownloadRequest(resource_dispatcher_host_,
-                                         info->process_handle);
+    info->process_handle.CancelRequest();
     return;
   }
 
@@ -96,9 +95,7 @@ void DownloadFileManager::ResumeDownloadRequest(
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   // This balances the pause in DownloadResourceHandler::OnResponseStarted.
-  resource_dispatcher_host_->PauseRequest(process.child_id(),
-                                          process.request_id(),
-                                          false);
+  process.PauseRequest(false);
 }
 
 DownloadFile* DownloadFileManager::GetDownloadFile(int id) {
@@ -147,8 +144,7 @@ void DownloadFileManager::StartDownload(DownloadCreateInfo* info) {
 
   DownloadManager* manager = info->process_handle.GetDownloadManager();
   if (!manager) {
-    download_util::CancelDownloadRequest(resource_dispatcher_host_,
-                                         info->process_handle);
+    info->process_handle.CancelRequest();
     delete info;
     return;
   }
@@ -269,7 +265,7 @@ void DownloadFileManager::OnDownloadManagerShutdown(DownloadManager* manager) {
        i != downloads_.end(); ++i) {
     DownloadFile* download_file = i->second;
     if (download_file->GetDownloadManager() == manager) {
-      download_file->CancelDownloadRequest(resource_dispatcher_host_);
+      download_file->CancelDownloadRequest();
       to_remove.insert(download_file);
     }
   }
@@ -384,7 +380,7 @@ void DownloadFileManager::CancelDownloadOnRename(int id) {
     // Without a download manager, we can't cancel the request normally, so we
     // need to do it here.  The normal path will also update the download
     // history before cancelling the request.
-    download_file->CancelDownloadRequest(resource_dispatcher_host_);
+    download_file->CancelDownloadRequest();
     return;
   }