[App Shell] Port app_shell to windows aura.

apps/shell/app/shell_main.cc

 // Copyright (c) 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 "apps/shell/app/shell_main_delegate.h"
 #include "content/public/app/content_main.h"
 
+#if defined(OS_WIN)
+#include "content/public/app/startup_helper_win.h"
+#include "sandbox/win/src/sandbox_types.h"
+#endif
+
+#if defined(OS_WIN)
+
+int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE, wchar_t*, int) {
+  sandbox::SandboxInterfaceInfo sandbox_info = {0};
+  content::InitializeSandboxInfo(&sandbox_info);
+  apps::ShellMainDelegate delegate;
+  return content::ContentMain(instance, &sandbox_info, &delegate);
+}
+
+#else
+
 int main(int argc, const char** argv) {
   apps::ShellMainDelegate delegate;
   return content::ContentMain(argc, argv, &delegate);
 }
+
+#endif  // OS_WIN