First pass at content shell for the Mac. Doesn't work yet.

content/shell/shell_content_main.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 "content/shell/shell_content_main.h"
+
+#include "content/public/app/content_main.h"
+#include "content/shell/shell_main_delegate.h"
+
+#if defined(OS_MACOSX)
+int ContentMain(int argc,
+                const char** argv) {
+  ShellMainDelegate delegate;
+  return content::ContentMain(argc, argv, &delegate);
+}
+#endif  // OS_MACOSX