Make web store resilient against download completion happening before opening.

chrome/browser/download/chrome_download_manager_delegate.cc

 // 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.
 
 #include "chrome/browser/download/chrome_download_manager_delegate.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 647 matching lines @@
 
   registrar_.Remove(this,
                     chrome::NOTIFICATION_CRX_INSTALLER_DONE,
                     source);
 
   scoped_refptr<extensions::CrxInstaller> installer =
       content::Source<extensions::CrxInstaller>(source).ptr();
   int download_id = crx_installers_[installer];
   crx_installers_.erase(installer.get());
 
-  DownloadItem* item = download_manager_->GetActiveDownloadItem(download_id);
+  DownloadItem* item = download_manager_->GetDownload(download_id);
   if (item)
     item->DelayedDownloadOpened(installer->did_handle_successfully());
 }
 
 void ChromeDownloadManagerDelegate::CheckVisitedReferrerBeforeDone(
     int32 download_id,
     const content::DownloadTargetCallback& callback,
     content::DownloadDangerType danger_type,
     bool visited_referrer_before) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
@@ skipping 177 matching lines @@
     int32 download_id, int64 db_handle) {
   // It's not immediately obvious, but HistoryBackend::CreateDownload() can
   // call this function with an invalid |db_handle|. For instance, this can
   // happen when the history database is offline. We cannot have multiple
   // DownloadItems with the same invalid db_handle, so we need to assign a
   // unique |db_handle| here.
   if (db_handle == DownloadItem::kUninitializedHandle)
     db_handle = download_history_->GetNextFakeDbHandle();
   download_manager_->OnItemAddedToPersistentStore(download_id, db_handle);
 }