Replace window.external with a v8::extension.

chrome/chrome.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 1564 matching lines @@
         'renderer/devtools_agent.cc',
         'renderer/devtools_agent.h',
         'renderer/devtools_agent_filter.cc',
         'renderer/devtools_agent_filter.h',
         'renderer/devtools_client.cc',
         'renderer/devtools_client.h',
         'renderer/dom_ui_bindings.cc',
         'renderer/dom_ui_bindings.h',
         'renderer/external_host_bindings.cc',
         'renderer/external_host_bindings.h',
-        'renderer/external_js_object.cc',
-        'renderer/external_js_object.h',
+        'renderer/external_extension.cc',
+        'renderer/external_extension.h',
         'renderer/js_only_v8_extensions.cc',
         'renderer/js_only_v8_extensions.h',
         'renderer/localized_error.cc',
         'renderer/localized_error.h',
         'renderer/plugin_channel_host.cc',
         'renderer/plugin_channel_host.h',
         'renderer/render_process.cc',
         'renderer/render_process.h',
         'renderer/render_thread.cc',
         'renderer/render_thread.h',
@@ skipping 1409 matching lines @@
                           '../tools/code_coverage/coverage_posix.py',
                           '--directory',
                           '<(PRODUCT_DIR)' ],
             },
           ],  # 'actions'
         },
       ]
     }],
   ],  # 'conditions'
 }