Revert 149794 - DownloadItem::Observer::OnDownloadDestroyed() replaces DownloadItem::REMOVING

chrome/browser/extensions/webstore_installer.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALLER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 119 matching lines @@
   friend struct content::BrowserThread::DeleteOnThread<
    content::BrowserThread::UI>;
   friend class base::DeleteHelper<WebstoreInstaller>;
   virtual ~WebstoreInstaller();
 
   // DownloadManager::DownloadUrl callback.
   void OnDownloadStarted(content::DownloadId id, net::Error error);
 
   // DownloadItem::Observer implementation:
   virtual void OnDownloadUpdated(content::DownloadItem* download) OVERRIDE;
-  virtual void OnDownloadDestroyed(content::DownloadItem* download) OVERRIDE;
+  virtual void OnDownloadOpened(content::DownloadItem* download) OVERRIDE;
 
   // Starts downloading the extension to |file_path|.
   void StartDownload(const FilePath& file_path);
 
   // Reports an install |error| to the delegate for the given extension if this
   // managed its installation. This also removes the associated PendingInstall.
   void ReportFailure(const std::string& error);
 
   // Reports a successful install to the delegate for the given extension if
   // this managed its installation. This also removes the associated
@@ skipping 10 matching lines @@
   // transitions to state REMOVING.
   content::DownloadItem* download_item_;
   int flags_;
   scoped_ptr<Approval> approval_;
   GURL download_url_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALLER_H_