downloads: clicking "remove" on chrome://downloads should also hide shelf item.

chrome/browser/ui/cocoa/download/download_item_mac.mm

 // 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.
 
 #include "chrome/browser/ui/cocoa/download/download_item_mac.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_item_model.h"
@@ skipping 12 matching lines @@
   download_model_.download()->AddObserver(this);
 }
 
 DownloadItemMac::~DownloadItemMac() {
   download_model_.download()->RemoveObserver(this);
 }
 
 void DownloadItemMac::OnDownloadUpdated(content::DownloadItem* download) {
   DCHECK_EQ(download, download_model_.download());
 
+  if (!download_model_.ShouldShowInShelf()) {
+    [item_controller_ remove];  // We're deleted now!
+    return;
+  }
+
   if ([item_controller_ isDangerousMode] && !download_model_.IsDangerous()) {
     // We have been approved.
     [item_controller_ clearDangerousMode];
   }
 
   if (download->GetTargetFilePath() != lastFilePath_) {
     LoadIcon();
     lastFilePath_ = download->GetTargetFilePath();
 
     [item_controller_ updateToolTip];
@@ skipping 48 matching lines @@
                          base::Bind(&DownloadItemMac::OnExtractIconComplete,
                                     base::Unretained(this)),
                          &cancelable_task_tracker_);
 }
 
 void DownloadItemMac::OnExtractIconComplete(gfx::Image* icon) {
   if (!icon)
     return;
   [item_controller_ setIcon:icon->ToNSImage()];
 }