Move OpenItem/ShowItemInFolder from ContentBrowserClient to DownloadManagerDelegate

content/public/browser/download_manager_delegate.h

Index: content/public/browser/download_manager_delegate.h
diff --git a/content/public/browser/download_manager_delegate.h b/content/public/browser/download_manager_delegate.h
index 5333938c3db9f338ec3c8d7fd350759992f027ce..add75c4ce4aee962bff250343dd626ba5ae05908 100644
--- a/content/public/browser/download_manager_delegate.h
+++ b/content/public/browser/download_manager_delegate.h
@@ -117,6 +117,12 @@ class CONTENT_EXPORT DownloadManagerDelegate {
                               const SavePackagePathPickedCallback& callback) {
   }
 
+  // Opens the file associated with this download.
+  virtual void OpenDownload(DownloadItem* download) {}
+
+  // Shows the download via the OS shell.
+  virtual void ShowDownloadInShell(DownloadItem* download) {}
+
  protected:
   virtual ~DownloadManagerDelegate();
 };