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

chrome/browser/download/test_download_shelf.cc

 // 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/download/test_download_shelf.h"
 
 #include "content/public/browser/download_manager.h"
 
 TestDownloadShelf::TestDownloadShelf()
     : is_showing_(false),
       did_add_download_(false),
       download_manager_(NULL) {
 }
 
 TestDownloadShelf::~TestDownloadShelf() {
   if (download_manager_)
     download_manager_->RemoveObserver(this);
 }
 
+void TestDownloadShelf::RemoveDownload(content::DownloadItem* download) {
+}
+
 bool TestDownloadShelf::IsShowing() const {
   return is_showing_;
 }
 
 bool TestDownloadShelf::IsClosing() const {
   return false;
 }
 
 Browser* TestDownloadShelf::browser() const {
   return NULL;
@@ skipping 25 matching lines @@
   is_showing_ = false;
 }
 
 base::TimeDelta TestDownloadShelf::GetTransientDownloadShowDelay() {
   return base::TimeDelta();
 }
 
 content::DownloadManager* TestDownloadShelf::GetDownloadManager() {
   return download_manager_;
 }