Make DownloadHistory observe manager, items

chrome/browser/extensions/webstore_installer.h

Index: chrome/browser/extensions/webstore_installer.h
diff --git a/chrome/browser/extensions/webstore_installer.h b/chrome/browser/extensions/webstore_installer.h
index 8d2ebb1100df00944cbd31c221b4e6797b744754..678dd0f3c2d159afb901801b15a9678c834a2f0e 100644
--- a/chrome/browser/extensions/webstore_installer.h
+++ b/chrome/browser/extensions/webstore_installer.h
@@ -55,7 +55,7 @@ class WebstoreInstaller : public content::NotificationObserver,
   // be skipped or modified. If one of these is present, it means that a CRX
   // download was initiated by WebstoreInstaller. The Approval instance should
   // be checked further for additional details.
-  struct Approval : public content::DownloadItem::ExternalData {
+  struct Approval : public base::SupportsUserData::Data {
     static scoped_ptr<Approval> CreateWithInstallPrompt(Profile* profile);
     static scoped_ptr<Approval> CreateWithNoInstallPrompt(
         Profile* profile,
@@ -133,7 +133,7 @@ class WebstoreInstaller : public content::NotificationObserver,
 
   // DownloadItem::Observer implementation:
   virtual void OnDownloadUpdated(content::DownloadItem* download) OVERRIDE;
-  virtual void OnDownloadOpened(content::DownloadItem* download) OVERRIDE;
+  virtual void OnDownloadDestroyed(content::DownloadItem* download) OVERRIDE;
 
   // Starts downloading the extension to |file_path|.
   void StartDownload(const FilePath& file_path);