Mountain Lion: use the system download progress.

chrome/browser/download/download_status_updater_gtk.cc

Index: chrome/browser/download/download_status_updater_gtk.cc
diff --git a/chrome/browser/download/download_status_updater_gtk.cc b/chrome/browser/download/download_status_updater_gtk.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6f045fff7696b9589d5118af4fdd0341710f0912
--- /dev/null
+++ b/chrome/browser/download/download_status_updater_gtk.cc
@@ -0,0 +1,16 @@
+// 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/download_status_updater.h"
+
+#include "chrome/browser/ui/gtk/unity_service.h"
+
+void DownloadStatusUpdater::UpdateAppIconDownloadProgress(
+    content::DownloadItem* download) {
+  float progress = 0;
+  int download_count = 0;
+  GetProgress(&progress, &download_count);
+  unity::SetDownloadCount(download_count);
+  unity::SetProgressFraction(progress);
+}