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

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

Index: chrome/browser/ui/cocoa/download/download_item_mac.mm
diff --git a/chrome/browser/ui/cocoa/download/download_item_mac.mm b/chrome/browser/ui/cocoa/download/download_item_mac.mm
index bf1ebc91e9e431fd4994cc5b5807438dd212131b..b39137cb104872a77293cdc344c8b1d1910de3ed 100644
--- a/chrome/browser/ui/cocoa/download/download_item_mac.mm
+++ b/chrome/browser/ui/cocoa/download/download_item_mac.mm
@@ -30,6 +30,11 @@ DownloadItemMac::~DownloadItemMac() {
 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];