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

chrome/browser/download/all_download_item_notifier.h

Index: chrome/browser/download/all_download_item_notifier.h
diff --git a/chrome/browser/download/all_download_item_notifier.h b/chrome/browser/download/all_download_item_notifier.h
index fa4c4be360c8d5dc0a5834979e40db0216f3c519..51de0ebcfab34f20e787f1ff2ecd6d3b88ce200f 100644
--- a/chrome/browser/download/all_download_item_notifier.h
+++ b/chrome/browser/download/all_download_item_notifier.h
@@ -51,6 +51,8 @@ class AllDownloadItemNotifier : public content::DownloadManager::Observer,
         content::DownloadManager* manager, content::DownloadItem* item) {}
     virtual void OnDownloadRemoved(
         content::DownloadManager* manager, content::DownloadItem* item) {}
+    virtual void OnDownloadShown(
+        content::DownloadManager* manager, content::DownloadItem* item) {}
 
    private:
     DISALLOW_COPY_AND_ASSIGN(Observer);
@@ -74,6 +76,7 @@ class AllDownloadItemNotifier : public content::DownloadManager::Observer,
   virtual void OnDownloadUpdated(content::DownloadItem* item) OVERRIDE;
   virtual void OnDownloadOpened(content::DownloadItem* item) OVERRIDE;
   virtual void OnDownloadRemoved(content::DownloadItem* item) OVERRIDE;
+  virtual void OnDownloadShown(content::DownloadItem* item) OVERRIDE;
   virtual void OnDownloadDestroyed(content::DownloadItem* item) OVERRIDE;
 
   content::DownloadManager* manager_;