Make startup_tests build and work on Mac.

chrome/browser/automation/automation_provider_list_mac.mm

Index: chrome/browser/automation/automation_provider_list_mac.mm
diff --git a/chrome/browser/automation/automation_provider_list_mac.mm b/chrome/browser/automation/automation_provider_list_mac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..4d408fd7108a92f442e246e43434e34d8d1e3320
--- /dev/null
+++ b/chrome/browser/automation/automation_provider_list_mac.mm
@@ -0,0 +1,13 @@
+// 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/automation/automation_provider_list.h"
+
+#import "chrome/browser/app_controller_mac.h"
+
+void AutomationProviderList::OnLastProviderRemoved() {
+  // We need to explicitly quit the application here because on Mac
+  // the controller holds an additional reference to g_browser_process.
+  [[NSApp delegate] quit:nil];
+}