Fix tweak_info_plist.py to be explicit about arguments.

content/shell/shell_browser_main_mac.mm

Index: content/shell/shell_browser_main_mac.mm
diff --git a/content/shell/shell_browser_main_mac.mm b/content/shell/shell_browser_main_mac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..75352460d12256484e8b61c839ca8d3324299cdf
--- /dev/null
+++ b/content/shell/shell_browser_main_mac.mm
@@ -0,0 +1,21 @@
+// 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_browser_main.h"
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/mac/bundle_locations.h"
+#include "base/memory/scoped_nsobject.h"
+
+namespace content {
+
+void ShellBrowserMainParts::PreMainMessageLoopStart() {
+  scoped_nsobject<NSNib>
+      nib([[NSNib alloc] initWithNibNamed:@"MainMenu"
+                                   bundle:base::mac::FrameworkBundle()]);
+  [nib instantiateNibWithOwner:NSApp topLevelObjects:nil];
+}
+
+}  // namespace