Enable opening downloads from the Mac download shelf

chrome/browser/download/download_shelf.cc

 // Copyright (c) 2009 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/download_shelf.h"
 
 #include "app/l10n_util.h"
 #include "base/file_util.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/dom_ui/downloads_ui.h"
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_manager.h"
+#include "chrome/browser/download/download_util.h"
 #include "chrome/browser/metrics/user_metrics.h"
 #include "chrome/common/url_constants.h"
 #include "grit/generated_resources.h"
 
-#if defined(OS_WIN) || defined(OS_LINUX)
-// TODO(port): port this for mac. See two uses below.
-#include "chrome/browser/download/download_util.h"
-#endif
 
 // DownloadShelf ---------------------------------------------------------------
 
 void DownloadShelf::ShowAllDownloads() {
   Profile* profile = browser_->profile();
   if (profile)
     UserMetrics::RecordAction(L"ShowDownloads", profile);
   browser_->OpenURL(GURL(chrome::kChromeUIDownloadsURL), GURL(),
                     NEW_FOREGROUND_TAB, PageTransition::AUTO_BOOKMARK);
 }
@@ skipping 43 matching lines @@
   }
   return std::wstring();
 }
 
 bool DownloadShelfContextMenu::IsItemCommandEnabled(int id) const {
   switch (id) {
     case SHOW_IN_FOLDER:
     case OPEN_WHEN_COMPLETE:
       return download_->state() != DownloadItem::CANCELLED;
     case ALWAYS_OPEN_TYPE:
-#if defined(OS_WIN) || defined(OS_LINUX)
       return download_util::CanOpenDownload(download_);
-#else
-      return false;
-#endif
     case CANCEL:
       return download_->state() == DownloadItem::IN_PROGRESS;
     default:
       return id > 0 && id < MENU_LAST;
   }
 }
 
 void DownloadShelfContextMenu::ExecuteItemCommand(int id) {
   switch (id) {
     case SHOW_IN_FOLDER:
       download_->manager()->ShowDownloadInShell(download_);
       break;
     case OPEN_WHEN_COMPLETE:
-#if defined(OS_WIN) || defined(OS_LINUX)
       download_util::OpenDownload(download_);
-#endif
       break;
     case ALWAYS_OPEN_TYPE: {
       const FilePath::StringType extension =
           file_util::GetFileExtensionFromPath(download_->full_path());
       download_->manager()->OpenFilesOfExtension(
           extension, !ItemIsChecked(ALWAYS_OPEN_TYPE));
       break;
     }
     case CANCEL:
       model_->CancelTask();
       break;
     default:
       NOTREACHED();
   }
 }