Fix Mac gyp error with disable_nacl

chrome/chrome_dll_bundle.gypi

 # 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.
 
 # This file contains resources for the main Mac chromium bundle.
 {
   # The main browser executable's name is <(mac_product_name).
   # Certain things will get confused if two modules in the
   # executable share the same name, so append " Framework" to the
   # product_name used for the framework.  This will result in
@@ skipping 128 matching lines @@
   'copies': [
     {
       'destination': '<(PRODUCT_DIR)/$(CONTENTS_FOLDER_PATH)/Libraries',
       'files': [
         '<(PRODUCT_DIR)/exif.so',
         '<(PRODUCT_DIR)/ffmpegsumo.so',
       ],
     },
     {
       'destination': '<(PRODUCT_DIR)/$(CONTENTS_FOLDER_PATH)/Internet Plug-Ins',
+      'files': [],
       'conditions': [
         ['disable_nacl!=1', {
           'conditions': [
             ['target_arch=="x64"', {
               'files': [
                 '<(PRODUCT_DIR)/nacl_irt_x86_64.nexe',
               ],
             }, {
               'files': [
                 '<(PRODUCT_DIR)/nacl_irt_x86_32.nexe',
@@ skipping 140 matching lines @@
       ],
     }],
     ['v8_use_external_startup_data==1', {
       'mac_bundle_resources': [
         '<(PRODUCT_DIR)/natives_blob.bin',
         '<(PRODUCT_DIR)/snapshot_blob.bin',
       ],
     }],
   ],  # conditions
 }