Fix tweak_info_plist.py to be explicit about arguments.

content/shell/shell_browser_main_mac.mm

+// 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