Move native_app_window code to apps areas

chrome/browser/ui/cocoa/apps/chrome_shell_window_delegate_cocoa.mm

Index: chrome/browser/ui/cocoa/apps/chrome_shell_window_delegate_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/apps/chrome_shell_window_delegate_cocoa.mm b/chrome/browser/ui/cocoa/apps/chrome_shell_window_delegate_cocoa.mm
new file mode 100644
index 0000000000000000000000000000000000000000..45da8ef569d1eab7f09525760973cdd6e51c9295
--- /dev/null
+++ b/chrome/browser/ui/cocoa/apps/chrome_shell_window_delegate_cocoa.mm
@@ -0,0 +1,14 @@
+// Copyright 2013 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/ui/apps/chrome_shell_window_delegate.h"
+
+#import "chrome/browser/ui/cocoa/apps/native_app_window_cocoa.h"
+
+// static
+apps::NativeAppWindow* ChromeShellWindowDelegate::CreateNativeAppWindowImpl(
+    apps::ShellWindow* shell_window,
+    const apps::ShellWindow::CreateParams& params) {
+  return new NativeAppWindowCocoa(shell_window, params);
+}