Split app.gyp and add a Win64 version of the app_base target....

app/l10n_util_dummy.cc

+// Copyright (c) 2006-2008 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 "app/l10n_util.h"
+
+#include "app/resource_bundle.h"
+#include "base/command_line.h"
+#include "base/string16.h"
+#include "base/string_piece.h"
+#include "base/string_util.h"
+#include "base/sys_string_conversions.h"
+#include "build/build_config.h"
+#include "unicode/uscript.h"
+
+
+namespace l10n_util {
+
+// Represents the locale-specific text direction.
+static TextDirection g_text_direction = UNKNOWN_DIRECTION;
+
+std::wstring GetString(int message_id) {
+  ResourceBundle& rb = ResourceBundle::GetSharedInstance();
+  return UTF16ToWide(rb.GetLocalizedString(message_id));
+}
+
+}  // namespace l10n_util