Download shelf autohides on showing in shell, just same as regular open

chrome/browser/download/download_item_model.h

Index: chrome/browser/download/download_item_model.h
diff --git a/chrome/browser/download/download_item_model.h b/chrome/browser/download/download_item_model.h
index 367e9ef677d515ff83640d87146a4d508e1c58b0..8c91231f00f29a605eb9a2c2b5447840ce0c3d04 100644
--- a/chrome/browser/download/download_item_model.h
+++ b/chrome/browser/download/download_item_model.h
@@ -142,6 +142,14 @@ class DownloadItemModel {
   // ShouldPreferOpeningInBrowser().
   void OpenUsingPlatformHandler();
 
+  // Changes what is returned by GetUserActed(). The download shelf uses this to
+  // mark remaining downloads as acted when user manually closes the shelf.
+  void SetUserActed(bool acted);
+
+  // Returns |true| if user acted on download item (shown it in shell or
+  // opened). Download shelf checks this to autohide.
+  bool GetUserActed() const;
+
   content::DownloadItem* download() { return download_; }
 
  private: