Move download stuff from download helper back to TabContents. This is basically a revert of r8576...

chrome/browser/prerender/prerender_contents.cc

 // Copyright (c) 2011 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/browser/prerender/prerender_contents.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/process_util.h"
@@ skipping 499 matching lines @@
   }
   set_final_status(final_status);
 
   // We may destroy the PrerenderContents before we have initialized the
   // RenderViewHost. Otherwise set the Observer's PrerenderContents to NULL to
   // avoid any more messages being sent.
   if (render_view_host_observer_.get())
     render_view_host_observer_->set_prerender_contents(NULL);
 }
 
-bool PrerenderContents::CanDownload(int request_id) {
-  Destroy(FINAL_STATUS_DOWNLOAD);
-  // Cancel the download.
-  return false;
-}
-
-void PrerenderContents::OnStartDownload(DownloadItem* download,
-                                        TabContentsWrapper* tab) {
-  // Prerendered pages should never be able to download files.
-  NOTREACHED();
-}
-
 base::ProcessMetrics* PrerenderContents::MaybeGetProcessMetrics() {
   if (process_metrics_.get() == NULL) {
     // If a PrenderContents hasn't started prerending, don't be fully formed.
     if (!render_view_host() || !render_view_host()->process())
       return NULL;
     base::ProcessHandle handle = render_view_host()->process()->GetHandle();
     if (handle == base::kNullProcessHandle)
       return NULL;
 #if !defined(OS_MACOSX)
     process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(handle));
@@ skipping 53 matching lines @@
     return NULL;
   DictionaryValue* dict_value = new DictionaryValue();
   dict_value->SetString("url", prerender_url_.spec());
   base::TimeTicks current_time = base::TimeTicks::Now();
   base::TimeDelta duration = current_time - load_start_time_;
   dict_value->SetInteger("duration", duration.InSeconds());
   return dict_value;
 }
 
 }  // namespace prerender