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

content/public/browser/download_item.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.
 //
 // Each download is represented by a DownloadItem, and all DownloadItems
 // are owned by the DownloadManager which maintains a global list of all
 // downloads. DownloadItems are created when a user initiates a download,
 // and exist for the duration of the browser life time.
 //
 // Download observers:
@@ skipping 71 matching lines @@
 
   static const char kEmptyFileHash[];
 
   // Interface that observers of a particular download must implement in order
   // to receive updates to the download's status.
   class CONTENT_EXPORT Observer {
    public:
     virtual void OnDownloadUpdated(DownloadItem* download) {}
     virtual void OnDownloadOpened(DownloadItem* download) {}
     virtual void OnDownloadRemoved(DownloadItem* download) {}
+    virtual void OnDownloadShown(DownloadItem* download) {}
 
     // Called when the download is being destroyed. This happens after
     // every OnDownloadRemoved() as well as when the DownloadManager is going
     // down.
     virtual void OnDownloadDestroyed(DownloadItem* download) {}
 
    protected:
     virtual ~Observer() {}
   };
 
@@ skipping 212 matching lines @@
   // true.
   virtual void OnContentCheckCompleted(DownloadDangerType danger_type) = 0;
 
   // Mark the download to be auto-opened when completed.
   virtual void SetOpenWhenComplete(bool open) = 0;
 
   // Mark the download as temporary (not visible in persisted store or
   // SearchDownloads(), removed from main UI upon completion).
   virtual void SetIsTemporary(bool temporary) = 0;
 
-  // Mark the download as having been opened (without actually opening it).
-  virtual void SetOpened(bool opened) = 0;
-
   // Set a display name for the download that will be independent of the target
   // filename. If |name| is not empty, then GetFileNameToReportUser() will
   // return |name|. Has no effect on the final target filename.
   virtual void SetDisplayName(const base::FilePath& name) = 0;
 
   // Debug/testing -------------------------------------------------------------
   virtual std::string DebugString(bool verbose) const = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DOWNLOAD_ITEM_H_